Full user review
"Actually pretty good"
It does what it says it'll do, it does it quite well. Audio and video chat.
Not many. It can take a while to log in, longer than YIM or iChat.
From version 8 onwards, it's actually quite a good application. Its feature set it still trails the Windows version, but that's not particularly surprising. It now video and audio chats on the public Live/Hotmail network, with Windows clients, which was the #1 complaint about the old versions. The corporate stuff has been pulled out into another app, simplifying and un-junking Messenger for the 99% of people who will never use OCS server. It also seems to be under more active development than YIM. Basically, a lot of people just don't like the Microsoft badge on it.