Bah! Not this discussion again.
Don't have one...don't need one, don't want one, and certainly not at the present costs. I'd much rather spend the $1.5-2K making the car more fun to drive. I prefer to do my route planning in advance, BEFORE I get in the car, not on the fly. Very seldom have I had to pull over to figure out where I'm going. I still like the old-fashioned paper map. But then, I'm OLD. 
Well of course you have no need for anything other than a map... you're in Edmonton! Drive too far, hit the mountains. Drive too far the other way and hit wheat fields. Go a bit too far north hit a polar bear, too far south, you'll find civilized folk who brush their teeth and hair (still wearing cowboy hats though)
Last weekend Dave (from this forum) and I ventured up to the Kawarthas for a little R&R with the ladies. We took the Lexus RX330 and had the navi going the whole time. My role as navigator was so boring that I had to resort to sneakily turning on Dave's seat heater to keep myself amused. Then we actually had to talk to each other... so we talked about boobs... then cars, for the next few hours.
In the Lexus, I noticed a few times that the system would show us driving along on a secondary road that would simply disappear off the map. I was not overly impressed with it -- the detail and information offered was substandard to the hand-held units I've seen lately. Since Dave has had extensive experience using the Lexus system, the Benz COMMAND system and of course the much-hated BMW i-Drive system, I asked him if he had a preference.
He suggested the Benz system was horrible. It's apparently overly complex and requires the DVD to be in the player for it to work (I guess in the Lexus you could still use the Nakamichi sound system independent or with the Nav). Surprisingly, he really liked the i-Drive version though citing its ease and speed of use. Go figure!
I've also used the COMMAND system before and can attest that the one time my buddies and I went "looking for a Chinese food restaurant in a strange city" (in fact, it was just Oakville), it took longer to program the damned system than it would have to simply drive around the city looking for the desired destination. The highlight of the entertainment was going against the voice command's suggested routes and making it scramble to come up with alternate solutions. "She" never lost her patience or raised her voice. Amazing technology that.
My wife and I are fairly proficient at map-reading so we've never NEEDED a GPS system and I recall on family cross-country trips growing up that my brother and I would fight over the maps so that we could study and memorize every place we ventured. Having said that, I've used the hand-held machines before and know that there are definitely some perks to them when the downloaded maps are thorough enough and up-to-date. A buddy of mine recently found his system very useful for helping to plan and navigate a long-distance bike trip into and through the Muskokas. The GPS system showed him abandonned railroad tracks that normal maps wouldn't have provided him.
The best 'fun' drive I took this year happened expressly because I DID NOT have a map or GPS. I knew the destination I needed and knew the direction I needed to head to get there, but as far as choosing a specific route, I just 'explored' my way there... empty and twisty country roads, through forests, over gravel, whatever. 2 hours later, I arrived grinning ear to ear thinking that the only thing that could have made life better at that moment was if I had just done the trip in a Porsche Boxster instead of my Audi.
I do have one fond memory of GPS usageto thought. It happened earlier this year at a Canadian Driver Sanctioned Function (the Auto Show). Hell, it only took us about 45 minutes last February to get James' system to find a beer store in downtown Toronto (remind me next year to just start walking as soon as you pull that thing out!).
