No i am not on Three. Since there are no Three transmitters where i live, and 02, which Three piggy back on when in a non covered area is not exactly great for reception where i live. Only 1 network gets full coverage where i live T-Mobile, the rest you cannot use indoors. So there would be no point to me joining.
I am not in any rush for it really, at the moment i can send and receive Video Messages between me and 3 of my friends, send and recieve picture messages between 5 of them, so Three would offer me nothing really, as its only advantage is Video calling, which my mates would have to get a new handset and change network to do.
May wait until it develops a bit more....