My Graupner is approaching 2 years old and never had a single glitch with it, I currently own/run 10 classes with a different Rx for each car and no issues, there is a newer version to also consider which offers some nicer features called the X-8E.

Another radio to consider is the HiTec Lynx4S, I've heard from several racers in my area that they are very happy with that system too.

I would stay away from Radiopost for too many reasons worth listing, I ditched them for KO Propo.

KO Propo would intermittently glitch on me and I had to re-calibrate each model memory about once a month, and having to do this across 10 models was a real PITA so I ditched KO Propo for Graupner.

Graupner has been awesome for me, but if I were to have any problems (which I don't foresee) my next pick would probably be Futaba only because the Magnum Junior was my first radio as a kid in the 80's. Main reason I didn't go with Futaba was because their price for Rx's were way too expensive.