Wayne, they are good in the sense that people typically have 2-3 of them laying around. Often people will carry one in their field bag with them as a spare, so if you are ever bashing and something happened to your remote you could loan one and swap your crystal to it and keep bashing. Now, the receivers aren't going to be any cheaper because its a 3-Channel, but I believe my LHS had them around $29 or so which is good for a 3-Channel.
I have a spare TQ3, in fact it's the reason I don't jump at buying another traxxas. I feel that I'm throwing away money because I don't need another radio, I wished traxxas would release kit verions of their rides (At least, I'm not aware if they have anyway). There's nothing wrong with the TQ3 for general bashing, I seldom get interference if ever even when my receiver wire was cut in half on a rollover on my 2.5 T-Maxx.