I was in your situation and elected to get the ACR Microfix for many of the reasons stated by Doug above. The deciding factor for me was my frequent trips to the canyonlands of Utah where getting a GPS fix is extremely difficult.

I'm also waiting for what I call "Spot 2.0" which should include text messaging capability. The technology is already in place and should not be expensive to implement. When they do that, I will get one and carry it beside my Microfix.