A great projector and at 4 grand a pretty good deal. Such a good deal I have to wonder if it is a private sale or if it is an online seller that is not authorized. If they are not authorized you may have issues claiming warranty, and it it does have issues it usually ends up being a massive bill to repair (probably as much as you paid). If it is a private sale I would make sure the person selling it would assist in any warranty issues as warranty is not transferable from what I understand.
As far as performance goes I have about 100 hours on mine now and love it. I had bad convergence, but the included convergence correction tools onboard helped substantially. Not super happy that I had to use zone adjusting but in the long run the picture is still fantastic. Another huge bonus is I have not lost any brightness in that hundred hours which is great news. JVC used a new bulb and power supply this year and it seems to be paying off huge. Seen a guy have 3 hundred hours and claim that the lux readings have gone up! That in my books is priceless. If you have a well controlled room as far as light goes you will enjoy this projector and with the lens shifting you will have no troubles with the location of your seating or screen location.