I put about 700 miles on mine last year, just finished the car up. Looking forward to putting on more this year.
Hardest part, I thought, was dialing in the throttle position sensor with a laptop (I'm no computer whiz, either).
What is good is now they sell a control module that no longer requires a laptop to change settings, you can do it right thru the module. I "think" price on it is $500 or so?? Might want to confirm with Keisler, though.
Overall, I'm very happy with it. Shifts nice, has a performance mode switch, and when the 4th OD gear kicks in on the highway it's such a nice difference. I've got 3:91's in the rear as well. I went with a Stage 2 unit & my engine put out 520hp on the engine dyno at the crank.

BTW, I did not have any "trouble" with customer service after my purchase. If I needed any tech questions answered they were very helpful & prompt. After giving them measurements for my driveshaft it was on my doorstop in 4 days.