Got my Chieftain the other day and I'm very pleased with it. The commanders copula is a bit naff but I'm converting it to a Mk10 so thats going to be changed.
£500 for the Pro version is a bit steep but it is a limited run (and I'm a Chieftain Fanboy). I think it's a lot better value then the Tamiya King Tiger.
One word of warning- be careful when you slide it out of the box, mine was upside down and all the accessories fell out.