MBX=POS IMO
Seriously... The MBX is not a very tough buggy. I had one that i covnverted to brushless some time ago and I wound up replacing in a mattr of weeks. The whole thing is very cheaply made. Hence the cheap price.
Never had a hyper 7 but they look alot better than the MBX for sure.
Although I do agree w/ Supra... look around for a decent used roller of a better buggy. The Jammins ar nice and you can get a decent used roller for $200. Much better in the long run.