ive been in rcing for over 10 years and i was wondering are these things really worth it? i hear alot of good and bad news about these things. i just got a nitro rc truck and could spend the money on hop ups for that, or i could buy an xmod. they sound fun to tinker around with. also i know you all have heard this alot, but 5 or 6 cell? is the 6 cell all that needed? thanks then.