Jazmini -- 2004 CVT, 20,000 miles, May 2007 -- no problems.
I don't drive that many miles, but do drive to work most days for a short commute of 22 miles round trip. I've got a cat-back exhaust and cold air intake (it doesn't really provide cold air, but that's the old term), but don't drive hard. Occassionally I'll shift spiritedly for a short time, but not really hard on the car, as the only thing that may be considered hard would be my downshifts, which can be in the 3k to 4k rpm range, but usually around 3k, with upshifts around 3k to 4k too. Most of my driving is in D for my mostly freeway commute, but use SD on weekends when not on the freeway.
I'm encouraged that Paul! talked to the MINI dealer, who said that CVTs don't have a high failure rate. I know there is a problem, but Sejanus is trying to find out to what extent it may be, so this thread can help.