This is by far the finest rack I have used. It is well designed and well make. It makes loading and transporting bikes so easy.
As mentioned in a previous post, the yellow knobs are a little tight and don't turn easily for me, mainly because I have rheumatoid arthritis in my wrists. Spraying WD40 on the screw threads helps a fair amount. That is the only issue I had with the rack. However, I did make an inexpensive tool out of PVC pipe that solved that problem. I took a short threaded nipple and put it into a threaded T fitting. I then filed a slot in the end of the pipe to make room for the rack adjustment screw knobs. This gives you a lot more torque on the knob and eases the stress on my hands and wrists.
The receiver adapter works fantastic and have no play in it at all. It is easy to screw the pin into it. Once tightened down with a box wrench it is very snug and won't move in the least.