I've got the Touring Plus (I'm a sucker for altitude and temperature) and I'm now really happy with it, although it did take me a while to figure out how to get the best from it.
The manual is absolute sh** - 14 pages, of which only 7 contain any information about using the device, and none of the instructions go into anywhere near enough detail.
Do NOT leave it to work out the route for you, or you'll find yourself taken on long detours to find cycle-paths at the expense of perfectly good roads.
When plotting a route on the PC, put waypoints in at every junction, and at frequent points along straight roads, and it will take you on the route you choose. Unless you do this, the route that is shown (an that looks eminently sensible) on the PC map will probably not be the route the Touring will take you on.
I'd strongly advise a few trial runs to get to grips with its quirks before using it in earnest.
Oh, and if you go for the Plus model, don't forget to power it on at least five minutes before you start moving, to allow the altimeter to calibrate itself.