I love my C91. Running ICS 4.1 and though there are some apps not compatible with it that I normaly use, no big deal. Other than that, the C91 is great and Zenithink looks like they are constantly puttng updates out, so they are working hard to improve it always. Go for it.
I agree I am more than pleased with my c91. I have tried the 4.0 and while it is smooth and "new" I prefer the latest gingerbread. ONLY because I use Netflix, HBO go, watch ESPN live stream and various other video sites. Ics is not yet supporting flash. But the beauty of the c91 is the ability to switch roms and versions with ease. Not to mention the growing support through forums. ( here and slatedroid which have very active and dedicated crew consistently improving andadvancing the possibilities of the c9. Very good choice for tablet. Definate green light. Please buy from an authorized dealer. Or at least make sure you are buying the real deal. There are a lot of knockoffs. Good luck