I had one while at college. I purchased every single hop-up that was available, motors, springs, gearing, tires etc. I then retro-fitted my 3PK rx to it so I could dial it in. For $150 total (including mods) In a dorm room or a gym floor, they're a hoot! But in the end, it was $150 that I probably should have spent on my full size r/c's.