The Acer P1163 has a maximum resolution of SVGA (800x600). That's 53% less resolution than a WXGA (1280x800) projector, which is the most common resolution. The resolution of all comparable spec projectors that came out more than two years ago ranges from nHD (640x360) (worst) to DCI 4K (4096 x 2160) (best).
There are a number of alternative data projectors that have a resolution of SVGA (800x600) currently available which you might also want to look at including cheaper multimedia projectors such as the Acer P1173 (£229.99).
If the resolution of this Acer data projector is not high enough for you then you might also want to look at the Acer H5380 (£349.99) (WXGA (1280x720)) which also has a higher rating.