Good question.
Here is my experience:
I bought a Hitec Mini6S for my Nexstar trying to save some money because it is tauted as extra long range, but it is a single conversion Rx. I had numerous glitches with it. I tried a buddy's SupremeIIs from Hitec which is a basic dual conversion Rx and bnever had a problem. I now own a SupremeIIs as well and have yet to have a glitch. I believe it comes down to an improper decoding of the signal coming from the Tx into the Rx. In the industrial world, you could think of this as not getting a verification from a checksum, but I am not sure how the radio industry communicates this info and if checksums are used.
I hope this offers some info.
Curtis