My $.02 on radio selection
IMO, its hard to beat the Airtronics MT-4....especially if you consider the pricing. My MT-4 feels great in my hands. It's very compact, super light and very comfortable. It works flawlessly and has every imaginable feature that I could ever need or want, along with some (like telemetry) that I'll never use. The receivers that it came with (2 included at the time that I bought mine) are a little big as compared to some of today's super tiny units......but they still fit well in my 1/12th scale cars. I have no regrets whatsoever, and it sure doesn't hurt that the MT-4 is about half the price of a M12.