Is this a decent projector?

This is not an HD projector. It all depends on what you are going to use the projector for. Keep in mind that a projector needs a dark room to be effective. The lamp on a projector are only rated at 2,000 hours. I would not recommend a used projector at all, if the lamp goes out there might not be a replacement lamp for it available. A decent projector would cost you from $1,000 on up. Pick up a copy of Home Theater Magazine May issue, it list just about every projector in the market today. Hope this will help you out.