I have two...an edge 705 and the edge 200.
I use these for brevets and such. The 705 stays on the map page and the 200
gives me distance,speed, total time and the like.
If you can do without the cadence function, the 200 is a great unit.
its really easy to set up. It will take .tcx files and give you a breadcrumb trail to follow (if you are on that page)
If you are on the main screen and are following a course, it will give you turn by turn pop-ups.
and its comparatively inexpensive.