The only thing keeping on a Garmin is that my OG AW Ultra probably won't last a mountain 50 miler (I've used it for easier 50 mile races). If it truly lasts anywhere near 45 hours, even my old, slow ass could knock out 100 miles in that time.

Plus satellite comms on the AW (which I'd have to spend money to upgrade the 965 to get that feature). I just might pick one up next week.