Unit: Garmin Zumo 550
Real world use: I haven't had it for too long and I'm still getting used to using it. So far it's been a good combination of a Street GPS and capable of being a Trail GPS with additional maps. Most of the time it's in the Landcruiser and I have used it to find addresses, businesses, etc around town.
On a Hole in the Rock run eairlier this year, one member of our group needed some hardware after loosing a nut for a control arm. Using the Zumo I searched for 'Hardware' and found the closest hardware store, with a name, address and telephone number. I was able to call ahead and verify that they had what we needed, before heading the 40 miles that direction.
The Zumo gives turn-by-turn directions with voice and text, which is handy in heavy traffic. It is also Bluetooth capable, intended for use while riding a motorcycle.
The Zumo is meant to be a motorcycle GPS, so it's waterproof, rugged and very expandable. You can upload additional maps, music, photos, etc, depending on what you're doing with the Zumo. It does have a battery, so it can be removed from the cradle and carried in-hand, but it is quite bulky compared to true 'handheld' GPS units. I am also into riding dual-sport motorcycles, so having a GPS that can work in my 4x4 and on the motorcycle is very valuable. I have a few Topo maps for CO, UT, AZ and NM loaded onto the GPS by way of a SD card for off-pavement travel.
Likes & Dislikes: I like the large, bright display screen, it's very easy to see. You can also click & drag on the map to view the areas around where you are and more, very nice.
My biggest dislike is that the Zumo records your path as a Track and it's quite difficult to convert it to a Route, for the purpose of sharing. And once you finally to get it converted, the Route will only show the same direction you traveled and cannot be reversed.
Another downside, it's an expensive unit, around $700-800 retail. I got mine used on here from another member by doing a trade of my Garmin eTrex Venture Cx plus cash, which was about the only way I could afford it.
Here's a photo of the Zumo in use-