APC greatly increased my WPM and accuracy on the highest actuation point. The light keys? the RGB is all 45G. Although as I said the R2 45G feels like R1 55G to me. I am not sure if I am alone on that or others agree. In quick order the thing will get as stiff as Cherry Blacks. About 3 years or so. OH, the GMK's, O-rings-lube and everything else on my custom RGB may have contributed to my better typing ability as well. I am not entirely positive it was just APC. Plus my board is setup with 8 actuation points. If you try to do any more than that it is an open circuit and just becomes infinite. IE, no APC at all then. However my highest is about .2MM. So there are a lot of different things going on there. I cannot say if just standard APC would make much if any difference for me.
Other than that, the cases are not perfect but certainly by no means "bad". Highly unlikely to fail under normal usage. Remember, these are used in offices and banks for many hours a day for years. Us enthusiasts are but a small market segment to them. I kind of doubt any Bankers are twisting their keyboards either. Honestly, both of them are fine I was just nitpicking. The case movement does indeed contribute to the overall good feel. It is not too stiff but rather forgiving for a plate. Almost like a PCB. Don't get me wrong I love them. I have many. Even both unopened. My custom RGB is my end game grail though. I guess if I had to pick one, I prefer the more compact style of the R2. BTW, the RGB DS ABS key caps are nicer than the PBT IMO but do not hold a candle to GMK or Signature plastics. I do in fact like shiny keys but only if they are thick DS.
So that is it. They are fine. They shall suffice. Expensive, yes. Would I like them to be perfect, yes! Are they, no! Does it really matter?, not really very much. It is not like they are falling apart or anything. You do not need to tape them shut out of the box. So they pass, and not just barely either. They pass good. They are simply not "perfect" which was my point. I figured for the money, from Japan they should be. Alas, they fall a bit short of perfection but they are certainly "more than good enough".