The Benq MW523 has a maximum resolution of WXGA (1280x800). That's 30% more resolution than a XGA (1024x768) data projector, which is the most common resolution.
A WXGA (1280x800) native projector resolution is actually the best resolution across all 13000:1 contrast ratio multimedia projectors that have been available for around the same time as the MW523.
A SVGA (800x600) native projector resolution is the worst resolution across similar types of data projector.
There are a number of other projectors that have a resolution of WXGA (1280x800) currently available which you might also want to look at including because of it's better review score, the Acer X1373 (£371.93), the Benq MW663 (£580.08), or the Optoma EW556 (£531.39).