I've just installed JB on my Onda Vi30D. I'd say its a good step up in user experience. It feels slicker, Play Store works with the official ROM. There are far too many Chinese apps but these are easily disabled and don't take up that much storage space. The biggest benefit in my opinion is web browsing particularly with Flash. No more flash ads blocking out the browser tabs and address bar due to the hardware accelerated flash 10.x. It's now running Flash 11.1 and appears to work well. I also have a Pipo Max M1 so I'll see if the Onda is as nice to use as the Pipo once I get the Onda fully installed with the necessary apps. So far so good.