Me and a bunch of guys (about 10) at work have these. So we've had an assortment of repair work. As far as weak spots go, here's what I know of:

Shock towers - soft aluminum and they bend easy with all of those adjustment holes. No breakage yet, just bending.
Shock shafts - snap right at the threading.
Axle drive shaft - had one snap at the pin hole.
Spur gear - tooth broke off
Diffhousing drive gear not the actual diff gear - teeth wore down and began grinding

Keep in mind, we've been bashing these pretty hard on concrete floors with jumps and big concrete pilars to dodge. So all-in-all, not too bad.

For 50 bucks, just get two and have one for parts. Beats ordering and shipping!

I did put in an order from Redcat racing. Looks like the foam bumper setup from their onroad version will bolt right on in place of the current bumper. Might help with the shock shaft issues...I'll post pics when I get em.

Paul