If you could get it for $200 it is probly a prety good deal, but i would find out more info on it like how much fuel has been run through it, was it broken in correctly what brand are the after market parts ect....
heavyduty a arms? dosnt mention any brand name stuff and doesn't seem to know to much about tring to sell a nitro.
your best bet when looking for used rc vehicles are seriously forums, most are a community type place and wont stand for anybody selling junk to their pals. and most of the time you get better deals from buds than some stranger from an add.
It looks to me like it's a T-Maxx 2.5 that has had a 3.3 engine put in it. If that is the case, the tranny and drivelines are all 2.5 and you will have to spend a lot of money just to make it handle the power that is already has.