I'm interested in any responses because I've been looking at the TMax too.
Nothing against the MVP - evidently it's a fine machine - but the fact that the battery is non-replaceable has kept me from pulling the trigger on it. (I'm quirky that way, the thought of trying something away just because the battery is worn out bothers me. Anyway...)
So the TMax has replaceable batteries, which I like. Evidently it's fairly big/heavy which is not surprising since it holds both an 18650 *and* an 18350. The weight doesn't bother me, I like the thought of having an extra (backup) battery right on board. And did I mention that it comes in pretty colors.
The only thing holding me back are the reviews I've seen (which haven't been so great). I think it's a wonderful concept.