I don't have the TACT so can't comment on performance. However, every DRC (digital room correction) system has detriments and benefits, and the TACT has its share. For instance, TACT can't improve modal ringing, though perhaps lessening a peak would lessen the extent of the ringing -- the ringing itself would still be there, though. The TACT cannot fix speakers, so you're going to have to start with a good speaker (ie, Bose is Bose no matter what you throw at it). TACT, by its very nature, cannot fix nonlinearities (i.e., the fact that it assumes the frequency domain response is equivalent to the time domain response entails linearity). This doesn't mean that the TACT isn't beneficial, just that it has its limitations, too.
I have used Ethan's products and noted immediate improvement in many areas. If I can ever get my ETF program working correctly (and the time), I'll post the results of using his products in my room.
Personally, I'm going with room treatments first and DRC second. You may choose a different path.