Of all the seat-of-the-pants comparisons done here on this board, the EAT chip wins out. I've tried EAT and the Bav Auto, and would choose the EAT hands down. Mark also posts here and is a great resource for all things motronic. Plus, many of the board members are test monkeys for Mark's products so you know they are put through the ringer by E34 lovers.

I think Winfred tried the JC vs. EAT with a few trial runs in his 535 and shaved a few tenths off his 0-60 with the EAT over the JC.