Jury still out, I got mine recently and went for a larger unit then I expect any of you guys would want, a Garmin 176, as I will be using it for Copper Canyon trips on my ADV R, and on my VFR as well. I bought mine on eBay figuring it would get trashed anyway, and saved $200 or so over new. If your planning on running off the batteries, I would check out TouraTech site. They have some info, as the batteries tend to arc at the terminals, and on thumpers it can get pretty bad, and oxidize the terminals. The trick is to use dielectric grease between the battery and the terminal, some units if you tape the batteries really good, and place some foam under the terminals, something like a chunk from some ear plugs. This is said to help. You don't even want to know what the Touratech mounts cost, argh.
Found this guy on eBay vl1066 his prices on memory, adapters, cables, etc. seemed awful low, but I gave it a shot, and everything showed up as advertised. I knew the memory wasn't Garmin, but a knockoff, but to my surprise everything else was actual Garmin stuff.