I signed up with unotelly and everything (including Netflix) works fine. I imagine YouTube should be fine without unotelly, but I use tubitv.com and crackle - both free tv/movies. Crackle definitely needs unblocking - tubitv might be ok without.
If you just want it as a powerfull little platform for xbmc then it will be fine. If you want to use the apps that amazon have you may need a geounblocker.
Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler