I don't really post here anymore but saw this and wanted to comment. I do not believe that system was designed by any GM people but rather by the same person who created the old Boss and Retrotek systems. See post 4 at the thread below:
Professional Products bought out Retrotek about six years ago and all the original people are gone. The problem with the Retrotek is that it was marketed as a "self tuning system" when in reality you really needed to tune it yourself to optimize it, and to get around some of the software bugs. One of the old software guys there told me as much but said the owner wanted it to be marketed as a hands-off does-it-by-itself system because honestly that's what anyone new to EFI would want to buy. This FI Tech system is probably very similar with hopefully some improvements and the addition of a keypad for those who are "scared" to tune their own system while still allowing you to use a laptop. The handheld-only units cannot be fully optimized, period. I believe some of the old Retrotek guys are also over at Procomp because their "Turnkey EFI" system...well, one of my friends downloaded their software, changed the extension on the end of one of his old Powerjection files, opened it with their software, and it loaded fine. He said the software still even had some of the old Powerjection bugs in it. I know for sure one of the Retrotek guys went there years ago (after he got fed up after the Professional Products buyout) because he showed me screenshots of the software he was working on for them, but I do not think he is there anymore.
Now, if you are happy with your MSD unit but just want to be able to do more with it I'd recommend looking into one of the Holley or F.A.S.T. systems that can be used as the ECU to control your existing unit. My friend went with the Holley HP on his old Powerjection and then eventually upgraded to multiport using the Powerjection TB to control air only, then installed a different throttle body altogether and has gone to sequential injection. I am doing the same on my Powerjection III system since the computer died a few weeks ago but am using the F.A.S.T. Sportsman XFI which was $1337 through Tick Performance. I'm controlling fuel only with it right now and it took less than two hours of driving time to dial the map in, and that was with the "autotune" turned off as it has the same learning function as the EZ EFI 2.0 system....it's basically a laptop tunable EZ. It did take some time going over datalogs and adjusting the base tune, but less than two hours of driving to do those logs. Actually it doesn't take much driving time at all if you can get datalogs of various situations. I had a friend drive some so I could tune on the fly but that was a waste of time.
A new V3.0 ECU for my old V2.1 unit would have been $500, bolted/wired right on, and did come with timing control (which V2.1 did not have but that some have said does not function correctly all the time) and I could have been back on the road after fixing the cal file for the new programming package. However, I just have a bad feeling that it will not be supported much longer so I went with someone who has been around a while and most likely will continue to be.
Next year when I have more cash I'm installing the F.A.S.T. RHS EFI intake, buying four more of the same injectors I have now, buying the dual sync distributor, and will be using the PJ-III throttle body for air only. Then it will be batch fire multiport with computer controlled timing...a real user tunable timing map not just "input total timing and RPM" etc.
I think most of these units use standard GM type sensors for TPS, IAC, CTS, MAP, etc. My new harness plugged right into my old sensors. I only had to buy a new MAP sensor because the PJ-III one was soldered to the ECU and install the IAT sensor in the air cleaner. Did a TPS sensor calibration and that was it. Input engine and injector parameters, let it make a base map, and go from there.
Once again, these "self learning" units are decent but they are limited in what you can do and how much engine you can run them on, like the EZ and Sportsman units need around 9" of idle vacuum to operate correctly. Lots of people have issues that could be tuned around if there was access to the software. I feel like they are meant to instill confidence in someone who wants EFI without overwhelming them. No harm in that, but you get what you get. There are even some things in the Retrotek unit I could do that the Sportsman XFI can't like fixed idle pulsewidth for a large cam. You have to spend more money to get everything, no way around it really.