It's hard to tell. But my neighbor's is on it's fourth year now, and it's fine. The pool actually looks in good condition from the pics, but again it's hard to tell. Is the pool currently filled? That pool costs a thousand bucks to buy here.
EDIT: Doesn't appear to be a salt pool so I would bet that the tubing is in better condition than mine. That PVC is pretty tough stuff. I think it's worth a gamble. One thing to consider, the pump that comes with that particular pool is, to put it politely, garbage. I would certainly make an offer on that pool. Then buy a sand filter/pump and I believe you will have a good deal. Again, if the pool is currently filled it would be easier to tell. Is it possible you could agree on a price, and then complete the sale only if you take the pool down, reassemble and fill at your place, and pay only if pool does not leak.