Not too long ago, high-priced, super-fast SUVs were so rare it could be a struggle to think of one example. Now, they're highly visible with more coming to market all the time. Mercedes-AMG has made such vehicles a core part of its business model. Not that cars have been forgotten either, as the likes of the new A 45, A45 S, CLA 45 and CLA 45 S attest.