Contact Diver6127 he has on or had one. From what I gather its a decent radio, but dosn't have all the adjustability as the higher end radios, but he will be able to tell you more.
VB is correct, I used to have one. I sold it because it didn't fit my particular needs.
The Spektrum DX3 is basically a rebadged JR XR2 radio. Even the servo's are rebadged with the spektrum name. It's a decent radio but as I said, it didn't meet my needs for adjustability. It has no accomodations for steering or throttle exponentials, deadband and only can take 3 models. I have a minimum of 3 r/c's that I race so, i'll need a higher number of model memory.
The radio is fine for most, just not for me. It should suit the needs of the general public, but for those that need the adjustability for racing, it will fall short. For those that will be racing, I would suggest getting a radio that can be fitted with the spektrum module.