The Benq MW571 has a maximum resolution of WXGA (1280x800). That's 30% more resolution than the most common native projector resolution of XGA (1024x768).
A WXGA (1280x800) native projector resolution is actually the best resolution amongst all projectors that have been available for around the same time as the MW571.
Amongst comparable types of projector the worst resolution is SVGA (800x600).
Alternative projectors that have a resolution of WXGA (1280x800) currently available which you might also want to look at include the MW665, or the MX631ST ($783.60) both from Benq which has a better Rating; or the Acer S1383WHne ($481.99) which is cheaper.