We run the 7100 and a laptop. We just finally figured out how to run topo on the 7100 which we used on our trip to CO. Still doesn't beat running the laptop, but it did have some cool information on it including campground, mines, graveyards, etc. We have used the SD card to upload POI's and use them as breadcrumbs to navigate a trail...not easy.
Our next project is figuring out how to upload tracks.
There are things I like about this unit and things I don't. Frankly I'm not that impressed with the Garmin Nav software around town. Josh has the Pioneer Z1 in his car and it is much nicer...the maps are high quality, the directions are better, and the XM interface is nicer. On the Kenwood the maps look like they were drawn by a 5 year old with crayons, sometimes the directions tell you where to go, and sometimes they don't (such as destination on the LEFT). One thing the Kenwood has over the Pioneer is its a bit more user friendly when it comes to navigating they system. In fact, the whole thing kind of looks like a cartoon with big buttons so its easy to figure out how to get to whatever setting/control you are looking for. We have added a backup camera to ours which is a nice feature.
IMO before figuring out the topo thing, if I had it to do all over again I would have hoped we would have gone with the Pioneer instead of the Kenwood. Now with the topo option I'm still kind of on the fence...maybe if we can figure out the tracks thing I'll be a full believer.
With that said we still run a laptop and always will. You just can't beat something that you can run 3 different map programs on at the same time, connect to the internet, download pics or video from your camera on the road, type up your daily blog entry and still carry into an internet cafe at some random stop.