I used the Spektrum DX3 for a total of 3 weekends before getting rid of it. It is a very BASIC radio. There are minimal adjustments on it (basics). No Exponential, no ABS, Traction Control, etc ... All the things that are in the other radios you mentioned. In a nutshell, this is the JR XR2 radio with a spektrum module in it. Even the servos are rebadged JR servos.
I do race my car competatively and this radio didn't have what was needed in my situation as far as adjustments were concerned. I would suggest passing on this radio if you are in to organized racing. If you run in the park and mess around with friends, then this is the radio for you.