Yes The first night Tricia and myself used it. It wasn't brilliant but not too bad. And we have used it again I think with Kaz. It isn't too bad, but it only allows 255 characters (including spaces) before you have to click on send so you need to keep an eye on when you get to the end of the line as it stops any more letters. I just keep an eye on it and when that happens if it is between a word I backspace to the previous word and then send and continue the sentance and send again. Sometimes you get a bit topsyturvy with your chatter putting their sentance inbetween your two lines, but of course if you are a girl you can cope with that.
The other thing to note is that although it says at the bottom 0 people in the chatroom or 1 in the chatroom etc.. it doesn't respond immediately that someone is in. I think the best thing to do if you are just going in and noone knows you are there is to login to it and stay there for a few minutes and hopefully someone will also just check. The other way is if you are already on and know someone else is on the same post and they are already aware of you, you can put in the post "lets go in the chatroom" and that way you can both be there.
Maybe the best thing to do is just give it a try. I know Tricia asked if there could be a bell or something like that that lets you know someone is in the chatroom, but as this was something that was just a freebie it only does what it does, and we can't change it at all.