Based on the reviews I’ve been reading, I’m going to hold-off spending a lot of time with the new WordPress 3.3. Like with most bleeding-edge software updates, there are going to be performance and quality issues with the initial releases that I’d prefer others spend time finding and resolving. My clients’ sites are working fine and the new features implemented in WP 3.3 are largely cosmetic – adding little in the way of functionality. It will take several weeks/months for plugin developers to complete their upgrades for the new system, where needed, and the WordPress team a similar amount of time to get all of the bugs resolved. We’ll revisit WP 3.3 next quarter and evaluate the benefit of jumping on the bandwagon.
In the mean time, enjoy the solid performance of your present system and know that we’re keeping a close eye on the progress of this new version of the WordPress core.