I've been trying out Chimera off and on since it first came out. I wasn't wild about earlier versions because they were pretty crashy.

However, this version (0.6) seems really solid. Plus, once you start using it you can see that it runs like a bat out of hell. Pages render lightning-fast, faster than any other browser I've tried under OS X.

Not bad. I'd say this version is extremely useable and well worth trying as an alternative browser to the usual suspects.