I disagree quite strongly with some of the comments - a dedicated GPS for the car (with touch screen and voice prompts) is far better than any general purpose GPS. Some cellphone GPSes may work, but always have some serious shortcomings, e.g. small screen, difficult address entry, no hands free profile (Omnia!!). A GPS for hiking and cycling will not work well in a car for the same reasons. A car GPS will not work for cycling and hiking because of limited battery life (ideally have exchangeable batteries). So while a cell phone or general purpose GPS will get you started, a dedicated GPS, or really good multipurpose design (e.q. Garmin Colorado, Oregon) will give you better results.
The problem is often on these forums someone explicitly says that they just want a GPS to find the odd street address and they have no need for it to climb Mt Everest etc and every time hardcore GPS users state that they should get a dedicated GPS device! The person wanting a GPS is probably on the market for a phone some time soon anyway (everyone is every two years) so why not get a phone with a GPS without being put off by inaccurate comments and articles like the one this thread is about - but i'll get back to that. This way they can see how much use they get out of it, what it's limitations are and then not be stuck with an expensive pretty, but useless, decoration in their cars in the form of a shiny dedicated GPS. They'll have a new phone and can replace it again in another two years.
I also question whether the people who say you need a dedicated GPS have ever actually used both extensively? I have had numerous business trips to Joburg where a dedicated GPS was a necessary addition to my rental car prior to the acquisition of my N82. I have therefore used both and cannot see the big fuss being made over one or the other.
Screen size? I am more than capable of seeing the directions on my N82, and it definitely doesn't have the biggest cellphone screen. Besides that, a voice tells you were to go. The odd glance at the screen is all that is necessary every so often!
Hands free? Why? Once I have entered the desired address into my phone or GPS I should have no need to touch the device again until I reach my destination!
Difficult address entry? Huh? Why? I type long smses on my phone daily. I am probably far more efficient at typing on it than I am on a GPS device!
Back to the inaccuracies in the article now. Well more half truths than inaccuracies. I got my N82 with a year, or two I can't really remember now, of voice navigation included. Further to this even with the slightest bit of tech knowledge, which most users of this forum appear to have, you can get Garmin XT etc on your phone with very little difficulty. Yes, the articles probably only discuss out of the box features but again someone reading it then only sees the apparent limitations of the phone option but not the possibilities.
I still argue, and yes Johnit does end by saying this, that the cellphone GPS is perfect for someone who is not a hardcore hiker, mountain climber or courier driver! Most people will probably find it more than adequate for their needs.
