Just like Ape, I decided to go with the LET tune last week.
Kudos to Jerry for answering all my questions and responding to calls well past the standard business hours.
I received my ECU on the 31st and decided to go for a test drive. Other than having an encounter with the law (it actually ended well with no speeding ticket), I can attest that the car has a different feel and my butt dyno feels the difference.
The shifts in S and M mode are substantially crisper.
The car responds a bit faster from the inputs from the paddle shifts, I had to wait quite a bit (like counting 1001) to do a second downshift, now the feeling of having to wait is mostly gone (I say mostly because I have driven F430 and the gearbox has instant response)
The car responds much faster to throttle inputs, no more waiting.
I did a 40 to 75mph full throttle passing a vehicle on a two lane road (this is where I got pulled over) and this is where you definitely feel the difference in horsepower. The car just howled past the 4K rpm range.
I will dyno the car over the next few months and post the results on the forum (I did not dyno the car stock but there should be enough data on the forum to get a baseline).
Finally, you just cannot beat the price of LET.
Gone but not forgotten:
09 C63 Steel grey
05 997S 6S Silver
04 S4 6S Imola Yellow
01 M3 SMG Grey
97 C5 6S
93 C4 6S