I've been using mine for years now. I don't use it for every day navigation though, My primary use is to just "mark the truck" so I can get close to, or right to it when the day ends.
The other reason I got one is, I tend to get back in a ways and if I down a big smasher towards the end of the day I can hide him in some brush and return later with some help.
I used to pride myself on NEVER getting lost in the woods, but about 7 years ago I was hunting on some property I was unfamilar with. On this property there were what the locals called "Bays" which are hardwood swampy bottoms that have never ever been logged in any way. They are really primal forest! The thing about the Bay I was in was that it all looked exactly the same in every direction. It was layed out in a rough oval shape, about 2.5 miles long and 1 and 3/4 miles wide. Surrounding that thing was what I'll call a "briar zone" some hundred yards wide that nothing short of a greased bunny rabbit could pentrate. Considering that there were only maybe 3 points of access to the whole Bay, it was a pretty formidable spot to get lost in. Which is exactly what I did. I had no compass and no GPS and no kind of flagging tape whatsoever. I spend upwards of about 6 hours wandering around inside this thing before I finally blundered across the narrow little trail that I had come in on. There probably was 15 minutes of sunlight left and it sure looked like I was going to spend the night in the bush.
I have one of the Magellan 330 mapping GPS's and I really love it, although I know there are much better ones on the market today.
I have the MAPSEND US TOPO map on CD that allows to me to link my GPS to my home PC and upload/download data betwen the two.
A favorite scouting technique with a GPS is to project a point out in front of me to whatever distance I feel is appropriate given the thickness of the terrain. Then I work my way towards it taking note of what I find along the way.