I was interested in digichat, until i tried their support. Went into chat room:
Me: Hello, can you point me to a largeish (say 50) concurrent user chat room?
Support: Yes, try
www.domain.com
Me: Thank you, any idea what server specs they are using?
Support: No.
Me: Ok, i will go and ask them.
Support: They will not know, it is one on our hosting service.
Me: Arrr.. I am looking for an installation on someones own server, running linux.
waited a couple of minutes
Me: Do you have a URL?
Support: Not off hand (exact words!)
Me: Any chance you could look one up?
... I asked a few more times and left.
Fat chance I am going to pay them $1,000 for something when they can't even give me a URL of it in action.