While the BenQ MX631ST has most of the essential features needed to compete with other business/educations projectors in this class, perhaps it biggest selling point for some customers will be the short throw feature. This will allow this projector to be used in some room layouts and situations where a medium throw projector would limit the screen size to smaller than desired.
BenQ offers two other short throw models in this MX63xST series. The less expensive MX630ST with 800 x 600 resolution and the more expensive MX632ST with 1280 x 800 resolution. Feature-wise these are all very similar.
I had issues with the adjustments available with this projector, especially for signals being input via the projector's HDMI input. Basically, many of the picture adjustment settings are greyed out and not available, thus not allowing the user to improve the image beyond the factory default settings. One option that is available is the ability to turn off the Brilliant Color feature and doing so substantially improves the image accuracy, but at the expense of a substantial reduction in image brightness. This latter point related to Brilliant Color is typical for many DLP projectors of this class.
I did find that when using Cinema Picture Mode and with Brilliant Color turned off, the resulting picture was certainly watchable, but could have been improved further if the menu's were not greyed out (i.e., not accessible to the user) for such adjustmens as color temperature.