I too own this projector. Great for gaming and hi-def movies. Don't let the 720p be a negative. You won't find any 3d 1080p projectors for this price. Also, most people who don't have a side by side comparison would probably think a 720 is a 1080 if they didn't know the specs. I have been running 720p projectors on 100"+ screens for years and the picture has always been amazing, just make sure you have the correct seating distance or else any projector will look bad if you are too close. This thing has a great picture, does 3d out of the box without any converters, and it is easily portable (even comes with its own backpack)which is great for those who only want to use it from time to time. Also, the speakers play pretty loud, although as with any built in speakers, the sound quality isn't good. Great for when taking it on the road somewhere, but not good enough for enjoying what you hear.
Now for the negatives. It is a short throw projector, so it will have be be placed in front of the viewer. Great for motion gaming like wii or kinect, but can be difficult for placement if you don't plan on moving it. It does not have any zoom on the lens, so you adjust screen size by moving the entire unit. You also have to adjust up/down and left/right (when centering it on a screen) by moving the unit. This can be tough when fine tuning the picture placement. You end up getting creative with placing different objects under it to get it just right. Ceiling mounting it would be even more difficult, so I wouldn't consider this model if that is your desire (assuming you have a fixed location for the screen). As for the 3d, it does project 3d without the need for any converter, but you do need to buy special glasses to view it. You will need either DLP link glasses or RF glasses (it does come with an RF emitter). Although it may not seem like a negative needing to buy glasses, when they average $70 per pair, it adds a lot to the cost of enjoying a 3d movie or game. If you have a family of four wishing to watch 3d you need to fork over close to another $300 before all can enjoy. No drop in the bucket! Also, it is DLP, so anyone that has issues with the rainbow effect may want to reconsider. I personally do not have any issues and have never seen the rainbow effect, so I would only assume this as a negative if you are effected by it.
So, considering the refurb price here, I don't think anyone that can deal with the negatives can go wrong with this unit.