Running 37's is no joke! I'm sticking with a TJ on 33's. If I want to go to 35's it's a small jump now. I think I just need the springs, shocks, big brake kit, and rear 4340 shafts for my Dana 44.
Savvy is the best. Not many have done the TNT thing, but I find some of their products interesting, like their Rock Sliders. MC is a little good, most not so good. Their marketing is a lot of hype. I think that's where people have problems. For example, I like the looks of some of their things, but what they are claiming, clearance wise, has been tested and is not true. Some of their claims work up to certain tire sizes, but not when you go beyond those tire sizes (they don't tell you that). Their springs amount to a spacer at the top, so you're effectively running a linear spring, not dual or progressive.
I hadn't heard of TNT until I bought this TJ and starting searching the interwebs on the platform. I like their setup the stretch on the front, along with a few other things. I haven't spent much time looking at the Savvy products, but will be doing so before I get too far along with this thing.