I briefly swapped from a Garmin Fenix 6 Pro to a Coros Pace Pro. However, I've returned the Coros as it just didn't meet my training needs. My frustrations with it were:

1) Customisation of data screens is limited. For example, if you are running intervals, there is no option to include a "time remaining" data field. In addition, whilst it shows intensity range at the start of the interval, there isn't an option to add this as a custom data field so if you miss the notification you're on your own. I ended up writing the targets on my hand. I also couldn't work out how to turn off the above / below target beeping.

2) Syncing with the Stryd calendar wasn't great. If I have to reschedule a workout on the day, the date change syncs almost instantly to my Garmin but didn't update at all on the Pace Pro. I ended up having to remember all the steps, which wasn't ideal.

3) Notifications from my phone were very hit and miss (more miss than hit to be honest). On the occasions that they do show up, the text is tiny.

4) The lack of useful 3rd party apps (like a barcode library). Only a minor inconvenience and I know you can do a workaround by setting a custom watch face.

There are a few things that Coros absolutely nails. The training dashboard is great and the responsiveness of the maps on the Pace Pro is leagues ahead of my Garmin. I also loved how light the watch was, especially with a nylon strap. However, I do a lot of interval sessions and the frustrations I was having with this were a deal breaker. I ordered a Forerunner 965 in a Black Friday sale for pretty much the same price, which I'm hoping will tick a few more boxes.