Although Rx has its fair share of problems, I'm 87% finished with the QBank at this point, and I can tell my future score has definitely gone way up because of it. I think a lot of us just get frustrated because we want things to be perfect, but in the end, if our results are better off, then enough said. I would hands-down recommend Rx and FA as one collective resource (in addition to Kaplan and UWorld).
Yeah, I agree. In terms of the low-yield that could be assessed, there still needs to be a degree of overlap with USMLE relevance (i.e. a LY detail regarding a HY topic).
However I must say, there are 220 articles on PubMed about Tangier disease, whereas there are only 4 on radial traction (UWorld assessed that).
Edit: now that I've done a little reading on Tangier disease, it's actually not that LY after all. I mean it's an alpha-lipoprotein deficiency, which is definitely USMLE-relevant, but I still see where you're coming from with Kaplan.