Although I do not often track, but for working in difficult situations such as tropical forests.
While the unit is robust, weatherproof fit, and has a very good reception, but what do you expect in 2015 in the era of smartphones and high-performance computers, for up to 280 EUR, would be at least:
A smoother map display, more resolution, better visibility of the screen.
A logical menu system and button operation! But that did not understand over the years Garmin. You get used to it though, but it's all bad.
Better integration of maps. While it is feasible but rather complicated to load a georeferenced image file into the device.