The JVC can be positioned much closer to your screen. For that 100” screen, as close as 9 feet, 10 inches, compared to the Sharp projector’s closest; 13 feet, 5 inches.
If you planning to shelf mount in the rear of your room, the JVC, still has a real advantage; back as far as 19 feet, 10 inches, compared to 18 feet, 2 inches. That extra foot and a half plus, may make a critical difference for a significant number of users' rooms. Of course, those with the Sharp could solve that problem by going to a slightly size larger screen, if practical. Overall, for those preferring shelf mounting (and that usually saves money on installation and wiring, compared to ceiling mounting), think this way: If your room is fairly square, and you like a medium to large screen size for your room, the Sharp probably won’t work on a rear shelf, as it would need to be too far back – further then the depth of the room. In addition, some folks with very long rooms, will find that the RS1 will work on a rear shelf, but the Sharp won’t, as it would need to be closer to the screen. There’s no good way to estimate what percentage of people might find the RS1 a good fit, and the Sharp, as impractical, but, if I had to take a guess, probably twice as many people could work with the JVC, as could work with the Sharp, shelf mounted in their room. It might be something like 45% could fit the Sharp, and 90% the JVC. (This is just my best guess.)
Quicktip; Generally, single chip projectors (DLP), have zoom lenses with limited range, and typically no lens shift, or just vertical, and even when they have lens shift, it is typically less than three chip projectors (LCD, LCOS, and the much more expensive 3 chip DLP projectors).