I should add that once I had my 705 it wasn't long before I found new uses that I hadn't thought of before purchase. Also, the Map Naivigation function has been far more useful than I would have thought.

I've got mounts on each of my bikes. When I take it to the gym I just use the heart rate monitor function so I turn off the gps and zip tie it to the spin bike with cheap, cheap zip ties. On the bikes I use industrial zip ties that are strong. Even so they aren't very expensive.

But, it really isn't convenient for running, skiing, or such. I can put it inside the top flap of my pack and it will record position and profile data for me to download later. But, I've not discovered any good way to put it on my body somewhere so it can be used real time. For that I think one of the 305 models would be best.