I drove one of these 2 weeks ago at an open day with Lexus Liverpool.
I love the way it looks, probably more so with the roof up. I thought the handling with the roof down was really boggy and sloppy, it was on 05 plate as well. I was convinced about the brakes either, trouble was I'd just driven a new GS430 which was fab in every area.
My biggest gripe was that the doors seemed a lot higher than the driving position, if you could imagine resting your arm on an IS is pretty much parallel, on the SC430 I had to rest my arm at an angle.