I've ran my 501x for 2 years racing weekly on a wide variety of high grip and low grip surfaces.
So far total breakages on this car are:
Rear Wishbone, landed short on a huge triple running on a 1/8th track with a 4.5
Front Shock Tower, hit a wall flatout
Front Shock Shaft, landed nose first off a jump into a block
I've never had to replace any pulleys, the belts I replaced once as they where starting to look a little tatty. My diff's go months between rebuilds and never lose any smoothness, I just re-grease them every so often. I've never had to remove camber links or the shocks to get the diff's out either, there is plenty of room to manoeuvre them in and out with the shocks and camber link's left on.
I wouldn't say the DEX is a bad car, I would love one myself but I have to say the Tamiya doesn't need much maintenance to keep it going well.
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