Have this combined with my Panthera EZ Mod and have had no complaints works perfectly!

If you're going to get a PCB alternative to the Brook Fighting Boards, then I believe this is the version to get. It's reasonably priced and has excellent support for PS4/PS5 upgrades and works with existing 4-pin and 5-pin cable harnesses produced for other replacement joystick PCBs. It's also compatible with the EZ Mod turbo panel replacement for the classic Mad Catz TE joysticks. The labeling on the IPFB is more orthodox and inline with what people have been used to from replacement PCBs for joysticks for over a decade now.
The IPFB has some advantages over other PCBs in that you DO NOT have to install a dedicated "HOME" button and that its flash memory allows it to remember the joystick lever mode (Left Analog, Right Analog, D-pad) you choose. This last point is important since the IPFB does not support an LS-DP-RS switch.
I recommend reading Jasen's Set Up tutorials and following those to the letter as much as possible. The Configurator website has changed a little bit but the Turbo values to be set remain the same.
Also, besides getting the firmware updates, make you sure you obtain the flash.nuke file from the GP2040 website in case you get into trouble with firmware updates. It's very difficult to brick this PCB but you want to be aware of what you need to do to restore a Pico PCB that has incompatible firmware revisions. Keep in mind that if you do get into trouble that you have to press a button on the Pico PCB to reset it before you plug in the USB cord! This is the button by the 2-pin JST connection on the IPFB, btw. It's laid out in the diagram photo Jasen provides for the IPFB.
I've managed to download and install incompatible firmware when trying to upgrade. Right now, firmware 0.7.9 (the latest revision) is ultra-compatible with the IPFB GP2040 CE Jasen has designed. I would recommend skipping over firmware 0.7.6 and 0.7.7 since they caused issues with the IPFB PCBs I own -- ie, buttons stopped working and the joystick lever no longer registered inputs. Earliest firmware I would go back to would be 0.7.5 but be aware this firmware revision is NOT fully compatible with some PS3 fighting games (which WILL require a jump drive/USB converter to allow full-PS3 compatibility on games like Super Street Fighter II HD Remix) and that the Turbo functions a bit differently with the earlier firmware. IMHO, you're better off sticking with firmware 0.7.9 which has full PS3 compatibility.

The IPFB Jasen sells is an excellent product for max compatibility with the wire harnesses sold for the Brook PCB format as well as EZ Mod/Mad Catz TE Turbo panel replacement.
The IPFB is different enough from the stock model Pico Fighting Board that there are issues with Pico FB firmware v0.7.6 and v0.7.7
IF you choose to flash your IPFB past firmware v0.7.5, you may encounter issues with joystick mode assignment. In my case, I found that the directions got scrambled regardless of joystick mode assignment and that the lever was not functioning properly. Flashing back to v0.7.5 resolved these issues. You really don't need to to have higher v0.7.5 at any rate to use with PC and PlayStation consoles.
My pushbuttons became disabled after testing v0.7.6 and v0.7.7
I needed to use the Nuke File to reset the IPFB AFTER rebooting the IPFB manually -- ie, plug the USB cord of the IPFB into the PC while holding down the BOOTSEL button on the IPFB PCB itself. (See provided IPFB diagram sheets uploaded by Jasen; they are a GODSEND to understanding this PCB and are NOT hard to follow.)
It's these specific reboot issues that may cause problems for people who do not read directions or know how to resolve problems on their own.
I really didn't feel like the GP2040CE website was all that user-friendly. The menu interface is a bit complex. I'm very, very glad that Jasen posted specific instructions for setting up the IPFB or I might have gotten very, very lost when setting up the IPFB. I can't say that GitHub website has a very good layout, period.
I brought up some of these points and a certain GitHub mod got on my case and treated me like I'd insulted him personally. I felt like I was dealing with an ultra-thin-skinned, ultra-bratty 3-yr-old. He is one of THE WORST moderators I've dealt with in 30 years of Net-browsing. I was not impressed with this emotionally-stunted individual who could not tell the difference between mild criticism of firmware/product and a personal attack. Never did I have any problems asking for advice from other people on SRK forums when similar issues were brought up. We dealt with issues with other PCBs (MC Cthulu, the PS360+) and the designers and vendors of these product were never as nasty to people as this GitHub JERK was to me.
Deal with GitHub at your own risk. If you ask politely around the older members of the Gaming Community, you might get help from other end-users. Just don't count on these GitHub coders to be anything but thin-skinned. Guys like the SOB I ran across would have been shut down quickly on SRK TechTalk 10-15 years ago. Yes, on other parts of SRK we had bad actors but for the most part TechTalk was more laid back and helpful. Autism is NOT an excuse for being an impolite jerk to people who are trying to help improve the accessibility of a product.

Amazing service, extremely fast shipping. Jasen never fails to deliver amazing products

IPFB is an excellent PCB with broad compatility with PS3 (70-80% of the games do work with the PCB) and near unanimous compatibility with current-day PC (Windows 7+).
There are still a few PS3 games that will not authenticate with the IPFB due to some coding/security that is not in the IPFB.
Given that the newer Brook converters DO work with IPFB and you get near 100% compatibility with PS4 and PS5 when you use jump driver converters, I decided to do an experiment with my PS3=>PS4 Brook converter (White, A1 PCB revision).
I plugged my IPFB joystick into the P3/P4 jump drive converter and tested it with 2 fighting games I'd always been locked out of with my IPFB joystick.
We have a working solution, Folks! Using the Brook P3/P4 jump drive converter, the IPFB joystick is now compatible with Super Street Fighter II Turbo HD Remix AND Marvel Vs Capcom 2 on PS3! The buttons that weren't working before ARE working now with the converter attached to controller. All directionals are registering, too!
Thank goodness it took less than a year to find a solution to the security/lockout problems! The hardware is already there to do this. Sure, people are going to gripe but what can you do?!? They probably COULD find a coding solution for this in the year AND include it with a firmware revision for the Pico Fighting Board but you have this now!
The P3/P4 jump drive converter is still available. $40. It's compatible with many PS3 controllers (not all -- the Hori Soul Calibur V/HRAP N3SA are NOT compatible with this converter) already on market including HRAP 3/SA/SE, HRAP V3 SA and I think the first 3-4 generations of Mad Catz joysticks including the problematic/incompatible with PC Generation 1/TE/PS3 joysticks. There's a full list of compatible joysticks on the description for the Brook P3/P4 converter on Amazon.
At this point, I'll never own an XBox console so "universal compatibility" is not a priority for me... Having my legacy controllers work across PS3, PS4, PS5, Mac, AND especially Windows IS my priority.