The highest resolution of the Epson EB-S18 is SVGA (800x600). That's 53% less resolution than a WXGA (1280x800) data projector, which is the most common resolution.
A SVGA (800x600) native projector resolution is actually the worst resolution amongst all multimedia projectors of a similar age and type to the EB-S18.
Amongst comparable types of projector the best resolution is 1080p (1920x1080).
Alternative projectors that have a resolution of SVGA (800x600) currently available which you might also want to look at include because of it's better review score, the X1140, or the X1140A both from Acer or the Epson EB-S17.
Projectors with a higher resolution that might be worth looking at include the EB-X20 (XGA (1024x768 and higher rated) and higher rated), or the EB-X18 (XGA (1024x768 and higher rated) and higher rated) both from Epson or the Acer X1240 (XGA (1024x768 and higher rated) and higher rated).