The Jeep Trail Guide is just a Garmin Quest 2 with minor extras. (Menu colors, Jeep POI's, etc.)
I already had a Quest from a couple years ago, so I just ordered the mount and it works great.
While the Quest 1 & 2 are a few years old they're still nice units.
I wonder how long that one runs on the Li-Ion battery? (Quests are up to 20 hours.)
Is it waterproof? Us Jeepers like to run / wheel with the top off, regardless of the weather.
Does it hold Topo maps? A street GPS is worthless once you go offroad. . . unless it has a "breadcrumb trail" feature (The Quest do. . . and you can upload that "track" to Google Earth and see where you were.)
How many routes does it hold? (These hold 50. So you can program in say. . . 45 different trails and then also have a different route for each of 5 days before you head out.)
Speaking of programming. Can you sit at the computer and program it? I'd really hate to have to use the touch screen to program in a full weeks worth of trails, POI's, etc.
You said it "does do the water stuff", so that's good as I like having the option of being able to load in "Bluechart" maps for when I decide to go out on the oceans, or I can load in the "inland lakes" maps for when I go to the local lakes. (Once again, since it's waterproof it's safe out on the water.)
Now, while the windshield mount worked fine I decided to go ahead and spend the $250 on the mount for no other reasons than to get rid of the dangling power cord, and it also has twin speakers that are closer to ear level, so that helps us hear it when the top is off. (The Quests come with a speaker / power cord combo unit.)
Nowadays, you can get Quest 1 refurbs's for $200 on ebay all the time. While it does have some weaknesses I still love mine.
The weaknesses? None in my opinion, but some have complained about the below. . .
They're not touchscreen. They don't have the text to speech option to say the street name. . . just the "turn in 100 feet". The Quest 1's only have 115 Mb of memory, so you do have to be picky with which detailed maps you load. The Quest 2 on the otherhand does have fully detailed maps for the entire US preloaded. . . but it's slower to load / update if you miss a turn, etc. Only 256 color display, and no option for a 3D "birdseye" view. They don't play MP3's, or show pictures, or have bluetooth.
IMO, I'd gladly take a Quest 1 from a known company for the same price. And finally. . . there's a reason Jeep chose the Quest 2 to use as the trail guide. It just works good for our purpose.
Edit. I don't work for, sell, or have anything to do with Garmin. I just like my Quest. (You can find these same comments from me on numerous Jeep forums.