I have a MTI 7x7 all aluminum with about 10000 miles on it. Trailer is 4 years old. It's been a pretty good trailer. I bought it unfinished on the interior and I'm glad I did. There were a few welds that needed some fixup and I could see them quite easily. For the price I paid for the trailer, there's no way I could have gotten anything else up here for the price. It pulls quite nice and tracks straight.
You can tell that some of the exterior screws are very cheap. I'm missing a few heads on some of them.
Last year I broke a leaf pack at about 1am while heading home solo. That was a pretty ugly experience I won't forget from here on out...only Torflex for this guy next time around. In MTI's defense, it wasn't anything to do with them...axle assembiles were made by Dexter and the way the leaf broke, I'm assuming it was self imposed damage as it didn't seem like a fatigue failure.
If you do have issues, MTI is very hard to get ahold of. When I had a few welds that needed to be touched up, I did it myself, but I thought I should make it known. Couldn't get them to reply.
Overall, happy with trailer. There's better out there, but at more money. Fit and finish and wiring wasn't perfect, but it's a trailer and keeps everything dry inside. I'm not sure spending more in my case would make me a whole lot happier.