I got my Hyper 7 pbs used, and have bashed the thing pretty hard on the track.  It has held together well.  I completely disassembled it after last race and found no broken parts.  I am, however, replacing brakes, bearings and fluids.  This is my first buggy, so I haven't driven any other buggys and can't compare to others, (other than to say that it can stay with all the others on the track) but this thing does handle much better than the revo I used to have.  I spent lots of money on that revo, and it handled like crap compared to the buggy.  I also broke parts every race with the revo, no broken parts yet with the buggy.
Hopes this helps some.