I've gotten used to bridge. It is a v1 product; the default and some of the interface is very slow and weird to use. But there are a lot of shortcuts and using it with Camera RAW works quite well.
Aperature's minimum operating system is a G5 1.8Mhz. Recommended dual G5 system. Well, it'd be an excuse to upgrade my lowly G4 1 Mhz system. But gee PS runs quite well on it.
I agree with James, I don't know that I'd buy a v1 product for $500. You would also certainly need to work with Photoshop, so it seems like an expensive browser/converter to me.
Hmm, might be fun to run into an Apple store with a few shots and see how it works.
But again, Apple has not supported RAW very well in the past, they don't support anywhere near all the formats that Adobe does now. Adobe has a huge lead in it's relationships with the various manufacturers and their versions and cameras. DNG will probably be the archival method used by most of us.
I hope some of this trickles down into iPhoto, as a browser it's very nice.
Jack