I picked mine up on Black Friday for $550 (
Fenix 6 Pro Solar) from the local bike shop. So far it's pretty awesome, although I just got it out of the box and configured on Friday night. I originally ordered a Black body/band and grey trim ring unit. However Garmin cancelled all those orders citing supply chain issues. Had to wait a week to hear the order was cancelled, then approve the grey body/band with black trim ring. It's still a fine looking watch, but not exactly what I wanted. That's what took so long for me to get my hands on it, and get it on my wrist.
In terms of Mountain Biking, the data it gives you back is amazing in it's depth. It's like a bicycle computer times 100. You get distance, speed, time, and other data like you normally get from a cyclocomputer, but you also get heart rate, breath rate, GPS position, and "grit" and "flow". Those last two are Garmin specific, and I'm not certain I can completely define them at this point. Something to do with how hard and often you push yourself for Grit, and how well you maintain a relatively consistent speed for Flow. I suppose I'll see some benefit here when comparing different course to each other over time. Not sure how else that would really help training at my level, although I can see pro's using it for comparison in picking up time on known competition courses.
Here's some of the data from my crappy little ride from Sunday:
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I also downloaded the GPX route from mtbproject.com for this route ahead of time. Once you go into the activity section on the watch, you can menu over to "Courses", Then "Do Course" and chose from the GPX files you've uploaded (or recorded from other rides). The watch then gives you feedback while you're riding if you're on/off course, and some general directions on how to get back to it from where you are. It didn't really like that I started in the middle of the course instead of where the GPX said was the "start/end" of the loop, but it appeared to have figured it out on it's own pretty quickly. I probably won't use that on my "known" courses anymore, but I'll definitely have it setup for any new places I visit in case it's not well marked, or otherwise easy to get lost on.
Garmin has an ANT+ cadence sensor that I think I'm going to pick up. I was debating about putting a computer on the bike, and was holding off until I got this watch and was going to decide from there. I'm a bit of a data junky/nerd, and even just this tiny glipmse of the amount of information you can get out of a GPS device is somewhat intoxicating for me. I'm even considering dropping the computer off the death machine for this same reason. The old cyclocomputer both doesn't have the data, and then has to be manually tracked/entered. This all lives in the cloud, and is sync'd a few times a day with the phone. Literally the only thing I'm missing right now is cadence, which is arguably NOT important on the mountain bike, but is an important metric on the death machine and the indoor trainer. A single sensor covers me there, and I should be good to go.
I'll throw some more details on the "smartwatch" portion of the watch over in the other thread when I get a minute this afternoon or tonight. So far I'm pretty happy with it.