My friend's and myself race in a buddies basement w/our 18B's and after 1.5 yrs, no one has had a diff go bad. That is after over 150hrs/. of run time.....here is a vid of our racing..
My 18B has the white truck body
http://www.youtube.com/watch?v=DH464JxEkoQ
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S