Just got my 20x10 charcoal AMR's yesterday. Must say the fit and finish was perfect! However it took a week, a freaking week, for these to come in. Ordered Thursday and expected them to ship out Friday, which they did, and then they were in Illinois for 4 days, Friday-Tuesday. All day Monday they sat in Illinois. Was pretty pissed about that but whatever. So they get here and I'm impressed.
AMR's vs Stock fan blades, I'm assuming that's what they are.
Now as for the noise, it sounds like the same noise as when you go over a bump. Kind of like a clunking noise. Made sure that all the wheels were tightened down. Haven't taken it to a mechanic yet so I'm not sure what it is. Sounds like it's mainly coming from the right rear. All in all I'm satisfied with it!