Hi cost few features and big screen
Ive just got the benq mp771 and i must say I am really disappointed with it , even though it has the capability of projecting large images in very small spaces it lacks from some basic features that every projector of this price should have , It also fails in recognizing signals from apple computers and you have to connect and disconnect VGA cable every time you want to project a VGA signal.
I include the number of features this projector doesn't include:

Pros: Great throw distance ( wich can be a problem if you cant make it small)

Nice brightness
Cons: The benq mp771 DOSENT have a manual zoom, it only have manual focus in its lens, so it needs to be located exactly in a certain distance to fill your screen perfectly, that is a problem when you want to fit perfectly the image into a screen and you are planing some fiscal place to put the projector.

The digital zoom only ZOOMS IN , what if I need a little more distance for the fiscal conditions to place the projector , why cant I zoom out the image even though I loose projection pixels in the screen , sometimes is needed to make the image fit in a certain size of screen.

The warranty its not global , I bought it in Canada and I live in Mexico and the manufacturer doesn't want to be responsible for the signal recognition problem in the VGA port of the NEW projector.

My final conclusion is , if you are willing to pay that much money for the capability of projecting large images in small spaces , measure perfectly the size of your room and your screen , use the projection calculator in the benq web site to assure you can adapt your fiscal conditions to the size of your screen remember once you locate the projector , you wont be able to make the image smaller, big can also be a problem if it is not controllable, It is clear that the manufacture doesn't mention anything of this in his tech specs.