I have an ET48 and MT410...awesome vehicles I wouldn't trade for the world. However, they are big, wide and heavy - best suited for larger tracks/bashing areas. They need more room to air out for sure.

Sometimes you just don't have access to larger spaces and you want something a pinch smaller and more nimble. Same durability, similar chassis, just a bit smaller footprint. Makes a huge difference, I can turn under most 1/10 scale vehicles easily.