GPS tech (Garmin, Hammerhead, Wahoo, RWGPS, etc)

Hmmm, been browsing the various GPS threads and just wanted to get opinions on how good the GPS system on the Garmin systems, specifically the 705 / 800, actually is?

The navigation would be the primary function for me as I'll be using it abroad to make sure I know where I'm going. Obviously the planning of routes will be done before hand. The cadence and heart monitor is not that important...

For navigation as the primary function I think that the Etrex range are the better option as opposed to the more training oriented Edge series.

800 review
http://www.bikeradar.com/gear/category/accessories/gadgets/gps-devices/product/review-garmin-edge-800-11-44426/

Etrex touring info
http://www.aukadia.net/gps/lwg_4.htm

http://cycleseven.org/garmin-etrex-hcx-cycle-touring-setup