If you use Google Nav, you’ll need to dl Morelocale 2 from the Market, unless you really like the american accent (voice determined by language settings, the 2.3 update gets rid of English UK).
Wifi also drops and changes to mobile internet much earlier than it did with 2.2 (This is a known problem). You can keep it connected to WiFi longer by turning off mobile internet.
You’ll also have a little less space for apps vs a factory 2.2 rom (might have a little more if you’re coming from the orange branded rom).
Those niggles aside, I’ve found it perfectly stable, a little bit faster, and the battery lasts slightly longer 🙂