One of your most important considerations when comparing the Sharp LC-90 with a same sized screen projector is how much and how often do you currently use your HDTV : if you and your family use the TV for many hours every day, do you really want to be concerned about bulb replacement, bulb exploding, colors changing throughout the life of the bulb, bulb cost replacement and availability, removing and opening the pj for new bulb installation, etc, etc.
You should also take into consideration where to place the projector (ceiling mount, table mount, shelf mount), the quality and gain of the screen, the distance involved, etc.
I own a LED projector from Runco exactly for such reason, however every time i go to the local Best Buy i just stand there mesmerized by that beautifully huge 80" picture of the Sharp LC-844 and i can just imagine what a 90" image would look like.
The only "problems" i have with these huge LCD HDTVs are shipping damage, panel quality/exchange allowed, reliability and repairs; I imagine the first problem could be easily solved by discussing the matter with the vendor, the second problem involves dead pixels, panel corners brighter than other areas of the screen, "banding" etc, but what would give me pause for such purchase is the reliability of these new huge LCD panels (although technically they are nothing more than larger panels cut from the same LCD mother glass that is used for smaller sized panels, but are these much larger panels as reliable as their smaller siblings ?) and if your Sharp LC-90 ever needs repairs, could it be done in-field or would you have to deal with the very difficult task of boxing it very/very carefully, finding a reliable shipping carrier and possibly having to pay for return shipping costs.
Personally i feel that Sharp should have designed these huge LCD panels from inception to be fully in-field serviceable with parts that could be easily swapped; After all, the biggest parts of these large screens is the LCD "glass" and the full array of LED backlights, both of which are apparently very/very reliable and once tested and quality-approved after manufacture at the factory should offer at least 50.000 hours of trouble-free use, whereas the other internal parts needed for repairs are smaller and could be easily stocked and carried by a trained repair tech.
If Sharp had offered such assurance i imagine all buyers would feel extremely confident going ahead with purchase of such humongous piece of tightly packed electronic equipment...
BTW, ultimateavmag,com reviewed the Sharp LC-90 last month and it received a very/very good review, with an excellent black level of only 0.002 ft-L (compared to the Pioneer Kuro and Sharp Elite that measured 0.001 ft-L), hardly any noticeable brighter corners and banding but poor 3D performance, which has apparently been rectified by Sharp in later production run.
Edited by MCaugusto - 10/12/12 at 7:24pm