The Yamaha Stage Custom Advantage drums are very good drums, with many owners being die-hard in their devotion to them. They have the renown Yamaha reputation for quality. If you like the birch sound, you will love them.
The set you are looking at looks clean and not abused, and it already has good-quality heads installed. Just check it for any stripped bolts in the tom holder, floor tom legs, and lugs.
The Ebay "sold" history on these kits shows them selling for lows of $200 (for the four-piece kit without hardware, like these), highs of $300. So the median selling price currently stands at about $250, and I would try to stay as close to that price as possible. Even at $300, you will not get hurt on them.
GeeDeeEmm