From the comments above I can see that most issues people have had have either been addressed, or can be tweaked for little or no money, i.e. Hubs breaking can be solved by putting a longer threaded ballstud in and having a nut on the back. for Other issues there is a hop-up availiable that will solve it i.e. shock tops and idler gears.
If you look at the amount of stuff that has come out already especially for the 2wd cars ansmann and the other companies involved are definatly working hard to fix issues.
At this rate we will soon have cars that we can lose it at the end of the straight and cause more damage to the wall that you crash into than the chassis.
Been racing Ansmann cars for over a year now and I really enjoy racing them. Looking forward to continuing with them for years to come