Chat plugin

Hiya,
I'm about to purchase this chat plugin called : arrowChat. Has anybody tried it? I'm asking because i have been conned by cometchat.I've paid $249 for their premium package: cometchat.com/buy and they never had it installed. The package said their professional technicains will do the installation but it never happened.I wrote to them on many occasion and they never responded so beware. NEVER EVER USER COMETCHAT

Thanks