These two projectors are not exactly the same. The W1100 is a 2,000-lumens projector that has a native 4,500:1 contrast ratio as well as a full 10-bit color processor. On the other hand we have the W1200 with its 1,800-lumens and a native 5,000:1 contrast ratio. The W1200 also has the same 10-bit color processor as the W1100 but comes with Advanced Color Wheel Coating technology in order to boost color saturation.
If you are really into using a projector for all of your home theater needs, then the built-in 10-watt speakers are probably not going to cut it for you. However, BenQ says, "MDU developers can now provide their residents with immersive sound right out of the box without the additional expense of add-on sound systems."
The good news is that both the W1100 and the W1200 are pretty affordable, for everything you get, at $1,199 and $1,499 respectively. However, BenQ is running a temporary special discount on the W1100. BenQ's website is giving a $200 rebate if you use the promotional code W1100$$. This drops the price to $999. Check out BenQ's website for all the details.
Source: CNET - BenQ markets new affordable HD projectors to 'high-rise' dwellers