Just picked up a GT-2125! I will be using it for my mids/highs though. Probably a set of MS-62c's as well.
I haven't been able to hook up the amp to anything, but I really am impressed with it. For having a fan and 125x2 it's about the same size as the JBL GTO 752 I used to have. The only thing I don't care for is the cover plate for the wires and crossovers. Just more screws to undo, not a big deal since I usually set and forget and it helps clean up the amp's appearance.
If I can finally work up the nerve to mess with my new truck and install a system or at least do the wiring, i can finally see what the amp is capable of. I hate having equipment sitting around while I have been dealing with Ford OEM speakers.