I bought a CPO 2008 335i convert 3 months ago. Had 24k miles on it. I've had zero problems and right now I have 29.6k miles on it. Took it in for the 30k since I had to get my oil changed anyway and no issues there either.
Love mine to death. Dat roof back feels good man. Gonna throw some mods on it in a couple of months, and get it chipped.
Although I realize I'll probably run into issues down the road, I'm covered until 100k/2014 so I'll worry about that when it comes lol.
With the top up feels pretty damn quick to me. With it down the weight is more noticeable. When it's down though it's less about speed and more about chillin
. Although there's been less of that lately thanks to hot as fuck Texans 110 weather my god.
When the payments of this are over I'm hoping to upgrade to a M3 or M5. Much as I wanted to get one this time I around I ran into a good deal on the 335i and had to jump on it.