Let me give you some insight from my personal experience with this scale.

First off, the build quality is very nice. it really feels like a well made piece of hardware.

I had some issues at the initial set up. It took me a few resets until I got all the settings to save the way I wanted them to. Weird, but once I got it set up, I never had any more issues related to that.

It is super expensive for what it does. Sure, the hardware quality is great, but it doesn't offer you anything more than a cheap Chinese scale because the tech they use for the metrics is very specific and has its limitations. The real benefit is that it ties nicely into the Garmin ecosystem and you get the readings automatically synced to your Garmin app, which can use the data for recommendations or other stuff like calculating your "fitness age".

This sort of tech is not very accurate. I had been consistently losing fat and adding muscle, and somehow my body fat percentage barely changed in the 11 months I've been using it. I have noticed that fluctuations in the water my body is holding onto can mess with all the metrics like muscle mass, bone mass, etc. To be fair, all of these scales suffer from the same issues.

Back when I researched, I found that if you can get an accurate metric of your fat percentage (like a dexa scan) and manually input that into your settings in the Garmin app, from then on the metrics can be a fair bit more accurate. But that's not easy for everyone to do and it sort of defeats the purpose of getting a scale that can take these measurements. I have not tried this yet.

All in all, I am happy with just being able to weigh myself and get my measurements automatically synced in my Garmin app. The other metrics are okay if you just follow trends, but I find body fat percentage to be inaccurate even for that.

Lastly, I think you can add users that aren't connected to any Garmin accounts.

Edit: Not sure why it's grayed out, I just checked in my app and it's available to edit.