I was late to the party, so I started with .588 instead of .573. Ran .588 for quite a while until a couple days ago when I made the jump to .595. A few of the bugs I'd seen around .588 (stopwatch timer behavior was always a little weird) are gone, and it seems more stable overall. Granted, it hasn't been very long, so I can't really give great impressions on battery life or stability at this point. The major reason I even upgraded in the first place was to run the leaked Netflix app that didn't work on .588, but I'm happy I did.
Sounds like the next "official" release is right around the corner, though, so if you're happy and stable where you're at, I'd stay.