My problem is space. 1/10 scale models aren't the largest available but they do chew up space. Once upon a time I was involved with multiple facets of RC not just armor: gas( ignition engine ) boats, helicopters and the first generation of 4WD offroad buggies. I've left all those except for the kyosho LJs. I focus on armor because IMHO it is the perfect RC hobby: no need for a flying field, body of water or race track, you can run them almost anywhere especially the smaller electrics...