Well, I'm going to head the opposite direction of those listed -
Having taught land navigation, and spent time alone in the big, dark woods - being unprepared can be quite the experience.
Having an adequate compass (the military ones are nice, but unnecessary), the CORRECT style of map, perhaps a protractor if you're so inclined, and the ability to read and locate your position are basic skills that everyone wandering the wild should know. A GPS is a helpful tool, but can sometimes cause more grief than good.
A PLB (Personal Locator Beacon) is another tool that is SEPARATE from general navigation. A PBL doesn't tell you where you are, it tells someone else (ie, EMS, Forest Service, SAR, your loved ones at home) your exact location in the event that the PBL is activated. This tool is your "Oh crap, I'm dead - come get me NOW" button to the rest of the world.
Many, many things can happen out in the woods. Especially while carrying objects that have a purpose of killing something, and possibly a person that is more intent on a specific animal than his/her surrounding terrain.
Imagine scenarios that would include slipping from a cliff side, having a limb fall from a tree in a high wind/rain storm while sleeping overnight, a treestand that lets loose at the wrong time - all of which could possibly pose a significant bodily injury (broken back, dislocated knees, etc). Every season in WI we loose hunters due to stress enduced heart attacks, or falls from treestands etc. Some of these people are hunting alone, with no way to reach help for days sometimes. Every now and then one makes it through.
I'm not trying to scare everyone into running out and purchasing a PBL, just trying to iterate its usage. A PBL is not a compass - it is not a GPS - it is not a Hollywood idea that a couple wraps of duct-tape and a treelimb will have me walking out of here to the choppper -
A PBL is Help, when you need it most.
If it makes you comfortable knowing that you have it, by all means get the one that makes you feel that way. SPOT, ACR, etc are all competent units.