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Had one on my C6 GS, was impressed with the change in driving dynamics, for my driving habits I usually was in med level settings in Comfort or Sport.
However the unit I had started having issues after a year, had intermittent scenarios where the settings kept reverting to OEM, I eventually just removed it and went back to OEM.
Thinking I may give this another try on my recently purchase C8 Z51 since the C6 GS experience was a while ago and current reviews are generally very positive.
I have had mine for a while and just recently tried the Valet mode. It wasn't what I expected. I thought it would limit the speed, but instead made the accelerator less responsive until I pushed down the accelerator further. It accelerated up into the 40+ mph region and continued to accelerate. It wasn't a smooth acceleration and power seemed to surge. It was them that I shifted back to the Sport mode.
Still a great product, just not what I expected in Valet mode. If a valet wanted to joy ride the car it definitely wouldn't stop them.
Reading a little more I noted that there are different levels of Valet mode. I will have to give the other levels a try and report back.
First mod I did and was very easy to install. You'll need your 10mm and that's it. Took maybe 10 minutes, if that. One of the bigger bangs for the buck you can do easily.
This product has my attention. I'm always skeptical about messing with anything electronic that could possibly cause issues. The reviews sure seem to be consistently positive though.. I might take a chance and order one for my truck, first, just to see if these are worth the hype.