The LogiLink UA0172 has a maximum video resolution of 640 x 480 pixels. That's 67% less video resolution than the most frequently found maximum video resolution of 1280 x 720 pixels.
A 640 x 480 pixels maximum video resolution is in fact the worst video resolution amongst all high megapixel count webcams that have been around for around the same time as the UA0172.
The best video resolution amongst similar types of webcam is 1920 x 1080 pixels.
Webcams with a higher video resolution that might be worth looking at include the Creative Labs Live! Cam Sync HD (£16.35) (1280 x 720) which is also cheaper.