I switched from an Edge 705 to a Dakota and it worked out for me, but it depends what bike functions you want.
Nearly everything about it is positive. The touchscreen is good (even with gloves). The display is readable. It's pretty accurate even in trees. The battery life is good (and easily replaceable with AAs). It's good and weather-resistant.
The main thing I miss from the Edge is the virtual training partner function. Also if you are following a route rather than a track, it displays with lots of pins stuck in the route. On some routes that I've downloaded the pins are all so close together that you can barely read the route. You can, of course, convert it to a track, but it's annoying.
Thanks for the map link pedalhead – I'll have to check that out!