I know a fella who used to have a 55 plate Lambo and now runs two RX7's instead. THe daily is pushing 500bhp and is a bit of a monster but it's nothing compared to the lunacy of the 1100bhp green beast he has for the weekends!
As for build quality of Maxdas I'd say they're on a par with the german metal of similar vintage. My MX5 has less rattles and squeeks than any of my MKII's of similar age and the plastics are all of similar quality. Can't comment on the leather as I've never had facroty leather in a MKII.
One things for sure. Mazda's run of the mill cars are pretty dull to look at but the MPS cars and the coupes and Roadsters are better than anything else out there for the money they cost.
Nick