If you are going to buy something off of ebay make sure you find a ride that comes with enough spare parts to replace most anything on the car one time. Then you should also plan on replacing all the bearings in the ride at the same time. Once you have this done you basically have a new ride.

I purchased a used high end roller off FleaBay a couple years back. The car came as described, kinda. I got everything they said I would and a bunch more, a bunch of headaches.

1) I found most all of the bearings were wore out. This was roughly a $100
2) All of the lower A-Arms were shot and needed replaced to tighten the car up $40
3) The person that assembled the model cut several corners that required me to have to replace a few minor parts but spend a lot of mine time fixing things $20

In the end I had a buggy, motor, pipe, wheels and tires and body off FleaBay for roughly $400 that I put another $160 in parts plus I still needed to purchase the radio gear, starter box etc....

I purchased a new Losi 8 kit about 7 months ago for $500.
New radio was rouhgly $250
New motor $200
New servos $200
New pipe $70
total.................$1225

Compare that tot he $560 in put into a used car and the only thing I didnt have to purchase was the motor and pipe. You can see the total cost of the FleeBay car was just as much if not more than the cost of the new kit.

Now is there anything wrong with purchasing a used buggy, no. You just need to purchase one locally that you can inspect prior to buying. This gives you the chances to check out the bearings, diff's, spur gears, etc... It doesnt sound like much but $25 here $50 there and the next thing you know you have the cost of a new kit in a used buggy!!!