I guess I am a little old fashioned, and leery of lumping all my things into one device.
When I go out I carry a handy talkie, cell phone, Palm PDA and a handheld GPS if I need it. I also have a computer based GPS for the motorhome.
I also carry a blood glucose meter, meds and insulin if I am out all day.
When I start loading up to go, my wife says I look like Batman cause I carry so many things on my belt.
I almost need a check list like pilots use so I don't forget anything.