I bought a CPO 2SS Fifty with NPP and a few other things. Having put 4k miles on it in the last few weeks (I like to take new (to me) vehicles on shake down road trips when I first get them), there are only a few things that come to mind for an "if I knew then that I know now" type of question.
1) I'm glad I got the NPP exhaust. It can be quiet(ish) when I want it to be (i.e. not wake up the neighbors when I start it in the garage, leaving for work at 6 AM).
2) I should've paid more attention to the RPO codes to make sure this one had MRC.
Although, the suspension that came on it is fine. I just keep wishing this one had a "comfort" mode for some of the rougher streets in the area. I haven't driven one with MRC, though (and I plan to keep it that way for now), so I'm not sure what I'm REALLY "missing."
3) Opening the sunroof (which had been a must-have on most of the vehicles I've had in the last dozen-plus years) has barely crossed my mind. So, if I were to get another one, I'd probably consider skipping the sunroof.