I have been thinking real hard about one I was going to get some feedback before I make the plunge. From what I have heard they have had thier team racers beat the snot out of them. I would buy the combo though the T8 motor that they come with are a hybrid sensored/sensorless motor which wont give you the intial lag at startup which will be great for racers and cool for bashers and this will give you the full benifit of the ESC...it is more costly than a MMM and the Hotwire computer interface is an additional $32...but word is they use higher quality components than Castle.....remember this is heresay from other forums
I personaly will sell my RS pro and buy one when they become more available, its not just the quailty, its the whole comapny behind it... and I never thought there was anything better than Castle's CS...