I have had mine on for 2 yrs. Hell of a lot more fun to drive. Tranny problems will occur but all depends on how you drive. I am pretty hard on mine and it has made it atleast 50,000 with it. That includes towing a 7x14 enclosed trailed. Never tried the stock programmer but if you don't like it, you may want to invest in tuning software or talk to Allen Nelson (
www.nelsonperformance.com). He did the tuning on mine, think he pulls about another 30-50 horsepower out of it. 0-60 times @ 6 lbs. are right at 6 seconds.
Hope that helps.
Tim