I just returned from an eight day float in Alaska and, because my parents are having severe health problems, I left my trusty 60csx at home and bought a Delorme with InReach so I could get word if things went south in a hurry. I think highly of Garmin gear and personnel, but this Delorme was so fast at getting a fix and the InReach so easy I'm selling my SPOT and Garmin.
Fact is, they all are pretty exceptional tools, and, as mentioned, they all need to be backed up with paper map, compass, and skills. I'm ambivalent about losing my self-reliance with these gizmos anyway, and all you need is one gear failure or dead power to be forced back into the classics...
Incidentally, if my bud had one of these sets instead of his Garmin, the two rafts wouldn't have lost each other for four days...though that was more about miscommunication than anything.