I've only flashed the ecu 2 times, each with a base map. Once when I went to stage 1/93, then after the tbe and uppipe install, and I went to stage 2/93.
Since I plane on leaving things as they are for a while, the only other time I think I'll need another flash is if I can find someone reasonably close, in a neighboring state maybe that can dyno the car and do a pro tune for me.
Good luck, as far as the Ecutek, my only quiestion about it would be if it can widen up the paramiters like the AP for the exhaust codes. Other than that, I think that any form of engine management will net close results, even if some are a bit better than others. My choice was made solely on price, the guy who tunes for the local Subaru dealer had an AP he unmarried from a trade in car, so for $300 I got it for quite a deal. Even with just the base maps, I've been very happy with it.