I got my MTE M3-2 about a week ago, and I like it a lot. I too had strange accidental turn-ons and turn-offs, and weird modes, so I blew out some metal shavings and cleaned up the crud, and since I did that, the light has been working perfectly. I've whacked it against my hand in all kinds of ways (bruising my hand) and nothing happens. Before, just setting it down on my desk made it flicker or turn on.
Yalskey, what broke on your light? Just curious.
At first, I also thought that the light output wasn't that great, but I think it's because the brightness isn't hugely more than a Q5 light's brightness (maybe less bright than some Q5 throwers). Rather, it's the size of the spot that's bigger with the MTE MC-E and P7 lights. To me, a big spot is way more useful than long throw.
I was told by MTE directly that the P7-D's spot is bigger than the M3-2's spot. I wanted a good balance of throw and spot size so I chose the M3-2, thinking that any 4-chip LED in a smallish reflector would have a fairly big spot anyway. I'm happy with it, although I'm very curious to see side-by-side beamshots of the two.