Wow, they are still around!

They made good parts, their upper arms were just a poor design. Gmaxx and intejunk solved the single upper arm thing with three attachment points to the bulkhead. HG's single attachment point was weak and developed slop quickly.
At one point I had a full HG t-maxx with chassis, arms, f/c/r skids, bumpers and hexes. I just used the bumpers on my pif-maxx build