I went through two Garmins. Both failed in under 2 years (random freezes, random reboots, eventually leading to bricking). Fitness tracking and GPS would activate by themselves at random times for no visible reason. Buttons sometimes wouldn't register. The proprietary charging cable was terribly designed - after a couple months, the springs inevitably fail and it starts losing contact with the watch, needing fiddling with the exact angle, blowing on the contacts, weighing down or attaching with scotch tape when charging for an extended time, etc.; basically, one learns to treat Garmin charging cables as a short-lived consumable. The software stack at least on Android is awful, and it's very hard to get your data out of it.
Considering how much these thing are hyped, I gaslit myself into thinking my first watch was a rare lemon, which is why I replaced it with another Garmin; but I won't be fooled again.
Their software is pretty bad but the hardware has been pretty bulletproof for me and I've certainly never had one randomly freeze or reboot in the decade+ I've been using them.
These are forerunners though. I haven't used their "fancier" watches.
Considering how much these thing are hyped, I gaslit myself into thinking my first watch was a rare lemon, which is why I replaced it with another Garmin; but I won't be fooled again.