As far as convertibles with back seats are concerned, it's hard to beat the charm and driving pleasure of a BMW droptop (how else could they sell these things at these price levels?). The 1-series is the newest chapter in that book, but, as Sam noted, that back seat isn't very serviceable. Wind noise is very tolerable at 80 mph with the top and the windows down - nice!
This is the first nonturbo 1-series I've driven, and I definitely agree with my colleagues. The 135i is incredibly powerful, smooth, and fun to drive, but the 128i is more challenging, more rewarding, and less extralegal to drive hard. Much like a Mazda MX-5/Miata, you have to think ahead and use your gears effectively.
Rusty Blackwell, Copy Editor