There is no design flaw with the way the rear arms attach with this chassis, like the other reviewer stated. The only flaw that other guy has is his driving!!
I've only ever had to replace the chassis once in all the years I've owned my DF-02, and that's about 6 years, and it broke because I let a complete noob drive my car and he hit a metal pole and it broke at the front, not the rear.
The only thing to be aware of is to not over tighten screws or else the plastic could strip with repeated unscrewing of them. Better yet, don't use the stock tamiya screws. Use the much finer thread 3mm screws. The finer thread will mean the plastic won't strip anywhere near as easy.