I agree about the plastic driveshafts but also I've only ever broken them when my slipper was too tight, or when I had way too long of shocks on the rear. Also I know quite a few guys that run 4s and as long as your not trying to standing backflip or full throttle from stopped they hold up...
Nice thing with the new mega's also is they are brushless ready. So the drivetrain(diffs,input gears etc) are the same as the 3s versions, so making the brushless change is a whole lot easier now. Believe it's just the motor, ESC and slipper assembly that needs changed. Just another thought if...
I'd put my Granite v2 up against any other 1/10 4x4 3s rig in the same price range any day! Nothing in the same price range would stand a chance, not even close! Not to mention the Arrma 2 year warranty.....
Arrma Senton all the way! The v1 rigs you had and the new v3 rigs don't even compare. Like comparing a station wagon to a Ferrari. In the price range you won't find a better truck than the Senton ?