We recently bought a GPS unit. We had considered it on and off for a while, then my SIL moved house to a far distant suburb (an hour and a half from our place) with which we were unfamiliar. It is in a semi-rural area with poor street lighting and poorer signposting.
SIL helpfully provided directions for how to get from her old place to the new one. Unfortunately she provided a different set to my MIL and to me. Both sets worked, but were significantly different. My husband was driving, I was in the front seat giving the directions. My MIL was in the back seat, also giving directions. Did I mention that they were different? My husband is a dear, good man, with absolutely no patience whatsoever.
We bought a GPS unit the next day.
We got the Garmin 610 nuvi, for several reasons:
It has a large, clear screen.
It will speak the name of the street (eg not just “Turn left” , but "Turn Left in 450m at Great Northern Road), giving you 2 chances to pick the correct street in a crowded intersection.
You can sync your bluetooth phone to it, so can really do handsfree.
You can load MP3/audiobooks into it. On long trips we listen to all 36 CDs of Ruby!.
It recalculates quickly if you do not take its recommended route, so you are not likely to miss the next turn. Very useful in a city with a lot of construction going on, where streets may be unexpectledly blocked.
It does have 2 drawbacks:
Its Australian accent isn’t accurate, so it is a bit jarring on common street names. The US accent may be more accurate.
It doesn’t always calculate the shortest route. But that may be addressed in the update which is due soon.
It is, in short, one of the purchases which we are most satisfied with.