I used it when I had a separate ICQ number for WEG. I wasn't overwelmed.
Tonda had problems with hers having too many ICQ addresses and went to ICQ lite and from what I know, so far, so good.
Then again I only have AIM for WEG and ICQ for other work, so I don't have a ton of messengers. If you can't reach me by ICQ, phone or email, then I don't want to hear from you