I was a member of cometchat and I decided not to use it anymore on my site... the support is horrible! (After weeks on insisting with forum msg’s and tickets, I’ve never received a reasonable and satisfactory answer). They keep adding stuff even thought it’s still buggy. It slows down the server, so much hostgator asked me to remove it!... cometchat is probably ok for vps, but not for a shared host...
Most of the users on my board complained that the board suddenly has gotten to slow and cometchat msg's, most of the time, did not get through... at the end, most of them decide it to continue the chat conversation on msn..
I do not enjoy giving this kind of reviews, but I feel I have to speak out. There are better products out there without succumbing to the hype of a facebook style chat script... just do your research correctly...
I like the way IPB implemented the chat solution. I hope xenForo comes out with a similar solution. I do not mind paying a small yearly fee to have an integrated, powerful and simple chat system like IPB’s