I have the aeolus xxx 6s with a disc cover for the rear. Used to run Flo 90s with a disc cover too. I opted for the disc cover because this way I had "2" rear wheels and can take the cover off it the weather calls for it or the race doesn't allow it. Granted there are only a handful of races that don't allow discs and I have yet to race in conditions that would warrant removing the disc cover, I like to know I have the option. Also, I can use the wheels on my road bike too.

As for arm cups, I have used the zipp vulas and the 51 speedshop. I prefer the 51 speedshops, they just feel more secure to me.