Resale value is pretty far down on the list of things I consider when buying any watch but it is something I think about. When it came to the Garmin I wanted the utility of AB elite above everything else; I also didn't have a smart watch so the ancillary benefits were worth the price premium over an iPhone app or a Kestrel.
Generally the best strategy to avoid ending up with a 5yr old worthless piece of tech is to immediately upgrade to the newest version while the old/current model is the least outdated it will ever be and has the most residual value. If Garmin comes out with a new version in 3-6mo and I still like the Delta I'll probably take the couple hundred dollar loss and sell it so long as the new version offers some worthwhile upgrades.
I haven't had a chance to go shoot with the watch yet but it has been worn daily and I like it. I just got the ultra fit nylon strap from the Enduro series and think I'll like the watch even more now. The Nylon strap it comes with is pretty nice but it's a little stiff and I feel like I'm right in-between two sizes, one hole is a little too loose and the next one is a bit too tight(that's what she said
). It's fine for daily use but if I'm going to wear it at night for the sleep tracking I need something more comfortable, same for running and working out. The Enduro strap is really soft, a bit stretchy and the velcro offers infinite adjustability. A little pricey at $45($59.99 from Garmin) for a basic nylon strap but well worth it for the added comfort. I'll probably get the grey one too.