The SLK32 was noticeably faster than the SLK320. To assign a value, I'd say it was 20% faster 0-60. It pulls really hard as soon as the supercharger kicks in. The SLK32 has a much firmer ride. Both of these cars are better at high speed touring than at cornering.

There are some criticisms I have of these cars. MB charges for metallic paint, $695 I think. Really now! No CD player standard. Really now! Steering wheel telescopes out manually, does not tilt. Cheesy! Cloth bolstering has crept into the "all leather" interior. For the extra bucks, the SLK32 should have the smooth nappa leather of the designo editions.