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I just installed mine a week ago with no problems. Today I installed a Transgo Shift Kit. The car is running great, but I will be contacting James for my custom tune to make things a little better. So far I am satisfied with the product. I hope this info helps.
You might want to wait a few months if you can. HPTUNERS is coming out with editing software for the Corvette, and EFILive will soon have tuning capability along with the data logging it already has.
I love mine!! For an A4 car, it is one of the best bang for the buck mods available. I installed the base tune, then played with the spark advance, fuel delivery, and trans shifting characteristics, and fan turn-on temps for several days. The car now has more power (very noticable STOP improvement), shifts right at or just over the red line and does so like it has a shift kit installed, and with the help of the 160 thermostat never gets over 190 degrees. And don't forget, its also a scan tool for all '96 and newer GM cars and trucks. That is, is can check codes, clear codes, and provides live data monitering while driving. The best $420 I've spent in a while.