I use this, also have a server set up for my PC so can host up to 8 people before it dies. Havent used it in a while but it can be fun, the only trouble I've found is that a lot of people find actually talking intimidating and talk more freely in posts which they can preview and edit

Don't think it would be good for an actual debate chat because of this, plus people might fall out or misinterpret things. Ive never found accent to be a problem, most of the people I talk to are not only from around the British Isles (which has a massive variation in dialect) but Europe and North America also and we get by. An AD teamspeak chat would be something I'd get up at 4am for