It fits like a glove, seems sturdy, and looks fairly good. You do have to unscrew the belt clip peg to easily take the case off, and it does block access to the battery cover and USB ports; however, the belt clip peg unscrews easily, and how often will you need to do this on the hill if you look after the batteries? Using the buttons through a thick lump of plastic can make them a little more unresponsive, but not annoyingly so, especially when you consider that the same bit of plastic is saving the screen from damage.
The negative comments here and elsewhere made me hold off buying one until I saw one in the flesh. If you want to protect your GPS60 from knocks, you can pick one of these up for ~£14; I'm pleased with mine. Three stars as it's good without being outstanding, and there is no alternative.