I have Magellan's flagship hiking GPS (Explorist 710). It's awful. The slowest GPS I've ever used. Something is wrong with the compass, the map constantly changes orientation on the screen and is almost impossible to read. Based on my experience, I would not buy another Magellan unit.

Complaints about my Garmin are more minor: auto lap by distance but not by location (so you have to press the lap button on hill repeats), assumes 1:1 when converting kJ to kC, etc. Both of those apply to the Fenix 3 but not the Edge 800.