QQ advert. *sigh*
I don't like the way that you can be horassed all the time.
Last time I tried it though was about 7 months ago.
Perhaps they've fixed that.
I have been using QQ almost since they launched it here. It is one of the few IMs that I can use from the office and it is often more stable than any of the available Jabber servers for my needs.
Although, it is a pity that you can't turn off requests for people to join completely like you can in other messengers.