The Benq MX514P has a maximum resolution of XGA (1024x768). That's 62% less resolution than a 1080p (1920x1080) data projector, which is the most common resolution.
A XGA (1024x768) native projector resolution is actually the worst resolution across all projectors that are older than two years.
A 1080p (1920x1080) native projector resolution is the best resolution amongst comparable types of projector.
It is worth also looking at alternative data projectors that have a resolution of XGA (1024x768) including a better rated multimedia projector such as the ZX212ST (£1,226.59), or the ZX210ST both from Optoma or the Vivitek D517.
If the resolution of this data projector is too low for you then you might want to also look at the SA560 (WXGA (1280x800 and higher rated) and higher rated), or the SA565 (WXGA (1280x800 and higher rated) and higher rated) both from LG or the Optoma ZW212ST (£1,320.32) (WXGA (1280x800 and higher rated) and higher rated).