You probably already know this, but don't rely solely on something electronic to guide you anywhere. They can be great supplemental tools, but shouldn't take place of tried and true methods.
I have a friend that relies on his way too much. So much so, that he has gotten into a bad habit of rushing to the places he wants to go. He doesn't stop, assess his surroundings, find landmarks, etc. We hunt in some very confusing country, with every drainage looking the same at first glance. I'm really concerned that he is going to get turned around in there at some point.
I do have one, but got it basically as a novelty. It is neat to see the path I've taken, and the elevations I've climbed, but honestly, I've gotten along fine without one for a long time.
One really useful benefit, though, is being able to share coordinates with someone. I had another buddy send me the coordinates of a huge hog wallow. He was scouting and got a picture of a monster wild boar. He said that spot was torn up with sign and every tree had a rub mark 3 feet high. I'll be making a trip down there this fall.