Ok... i've receive my tablet 2 days ago, and i've receive 2 update: one for the .30 and the second to Jelly Bean. I've done the first one, but when the second update popup, i've decide after 5min in front of the tablet to process, with the know of the risk.
And after 2 days nows (running time of 49h), no glitch, no reboot, no sleep of death, nothing. Run very smooth, charge real fast (amazing, take only approx 2h to charge from 24% to full charge). The only thing append, is IF the screen is up AND the charge is in progress, I see a big OSD icon of the battery to indicate the state of the charge.
Otherwise, all run great. I've disable the GPS and the Bluetooth because i'm not using it. I have no dock, no need to root or unlock the bootloader because i'm not using these features.