As always, if you want a real review, read DC Rainmaker's review. This is a quick wrapup of my general impressions of the device and whether its worth the upgrade for the average runner from my last watch, the Forerunner 235.
My view is that if you have a lot of Garmin love - you are the kind of person who doesn't run without it, wears it when not running for things like step counting and 24/hr heart monitoring, the answer is a yes. I'll run through the biggest pluses:
1) Improved battery life over the Forerunner 235. I have had it set to GPS and Glonass, Bluetooth and 24 hour hr on, alerts for calls and calendars on. I have run 6.5 hours over the last four days. And the battery is at 57%. I'd estimate 10% drawdown is for the background functions, 47% for running, which means about 5% per hour for running. Garmin says 24 hours on GPS - that may be right if Bluetooth and HR is off. For the full kahuna of settings, I'd feel comfortable that it would have plenty of juice left after a 50 miler or a 12 hour run. And going away for a week of travel no longer means stressing out about whether I pack the cable - it should be good for an hour of running a day for seven days plus background draw and still have 50% left.
2) Better display. I find it to have improved contrast and outdoors readability in bright sunlight.
3) More accurate Elevate wrist HR measurement. This is completely subjective, but I see less unexpected spikes or cadence lock where the module gets stuck measuring your footfall cadence instead of your heart rate. It also seems to be giving more accurate readings when I do things like get up from my desk and run up the stairs - getting to the peak and returning to rest faster than the 235.
4) A more comfortable strap. I don't have to tighten and loosen it depending before and after each run. It measures HR well with a more lax tension; I think it is a little more rubberized and grips to your wrist better.
5) Barometer. I always felt like I was getting ripped off from the estimated elevation gains on Garmin and Strava. Hopefully this is more accurate.
6) Better looking. Small changes include the metal buttons and the improved case and bezel. It just looks more quality than the 235.
7) Additional running metrics, including readings on aerobic and anaerobic training effect. I find it helpful to see these post run. I'm looking forward to getting training status reads after I've been using it for a month as well.
8) Ability to set alarms using Garmin Connect mobile rather than only on the watch. I often realize after turning off the lights that I haven't set my watch alarm for an early race wake-up. It's nice to set it on the phone - a lot easier than fumbling through several layers of menus on the watch to do so.
9) A nice solid feel on the wrist. The weight is heavier than the 235, but not that noticeable. It is a lot lighter than the Fenix line which just was too uncomfortable for me. Given that it has the most desirable of the Fenix 5/5S functions, the size and weight is a real plus here.
10) Improved activity move bar response. Again, a subjective take, but it seems like the move bar is more consistently cleared with exercise. Sometimes the 235 would take forever to do so.
There you have it. Sorry to push you over the edge if you were wobbling, but I don't think if you are reading this you'll end up regretting it.