I never thought I'd be using a GPS - I kept my trucks stocked with paper maps and a compass.....
But in my line of work, I have to travel over about a 40 mile radius from home - which includes a large city that is notorious for one-way streets and "can't get there from here" detours. I tried printing directions and maps from Google and Mapquest, but after getting lost 4 times trying to find two jobs (usually because the directions left out something important or that the road you were told to turn on was closed) I was fed up and bought a GPS. I don't always trust it, sometimes it wants to take you the long way around the barn, but if you need to get somewhere that you've never been, it can be a lifesaver - especially trying to drive a stick-shift truck in city traffic.
A lot of times I leave it on the dash and don't program a destination if I know where I'm going, it's nice having a handy map folded to the exact square you're in sitting on the dash if you have to detour.
I went with a Magellan unit, free map updates for life and a reasonable cost, does everything I need it to and does include at least some forest roads. The downside is that within the first year the internal battery took a dump (which made the thing unusable), warrantied it out and the replacement lasted around three months before the screen went wacky. Another replacement and this one decided it didn't want to pick up the satellites after a week or so. Another replacement and it was DOA. Bets were made at that point that my next replacement would be a box of parts.... but I actually got a unit that worked for a change.
My paper maps and compass stay in the truck though - it's something that doesn't break. Murphy's Law states that technology will fail when you desperately need it.