I currently have 3 pairs of VFFs. I started with a pair of Classics in Spring of 2009, worn 90% of the time, and developed a hole in the ball of the sole after 14 months. I patched that with shoe goo, and continue to use them as house slippers.
I also have a pair of Treks which I bought when they were first available last year. I wear these when it's cold, raining, or need a more subtle shoe.
Recently I got a pair of Smartwool Classics to replace my old Classics, but had to send them in for exchange due to several holes appearing in the wool uppers after the first wash.
I'd really love it if Vibram would make Classics with a smartwool footbed and a kangaroo leather upper. Ideally it would also have velcro to hold the adjustment tab flush with the heel, and not use yellow for the stitching of the logo on the front of the shoes.