You should ask for the average lamp life for people with the original bulb vs. those with the redesigned bulb.
I was seeing issues with my original bulb at about 300 hours. I contacted JVC and they sent me a replacement bulb with the new design. I still have the original bulb in the projector as it hasn't seemed to have gotten any worse, but I am only at about 600 hours. I did a pre-order on the projector back at the end of 2011, but didn't install it until almost exactly 1 year ago to the day. We almost exclusively watch movies on it, with the occassional TV show or major event like the Super Bowl, so it may seem low, but actually ends up being a lot of movie time for 1 year. So I don't have a full answer for you, but I did want to mention that there are 2 different bulbs out there to take into consideration.
Good luck. It is a GREAT projector.