Burnt polerizers are easy too spot as discolored splotches on screen and are not repairable at a reasonable cost. Dust blobs are similar but the discolored spots generally can be brought into focus where burnt polerizers can't. Dust blobs are fairly easy to clean out if you know what your doing. If you have all Blu Ray I wouldn't get anything but a 1080p projector if at all possible but if 720p is all you can afford it won't be bad at your seating distance.
Last edited by rekbones; 09-30-2017 at 01:19 AM.