I don't have any problems installing ROMs from "elperroderoke". B706 is working fine too.
Bugs fixed:
- 1.5s voice delay in answering calls ... for me this one was the biggest BUG from the moment I've bought the phone with B104 firmware !!!
- video stuck in gallery only /FF or FR/, youtube still present ?!?
- BATTERY IS GREATLY IMPROVED
I don't know is there a different kernel in B706, but in Antutu the score is 1500 lower than B705 /11500 vs 13150/.