I use the metel gear version of those hitecs in a precision aerobatics bandit (3d model). Resolution is pretty good on that model so I assume it will be no problem on the sumo.
I'm more concerned about the power system on the TekSumo, I really don't know if it's suitable, it's much heavier than the hobyking recommended but then again I'll be balancing it out with a gopro up front and a 2200 3S battery.