I've run with Garmin since switching from Polar S625X to Forerunner 205 back in 2005 and currently using a Vivoactive 4.
Bought a Coros Pace 3 nylon band from Coros for $229 shipped
First day/run review Note: no interface comments as Coros is new to me vs. Garmin
0.5% distance difference(Garmin higher) and 20bpm HRM average difference(Garmin higher)
Positives
+ Acquired the signal in half the time while standing right next to my suburban house
+ More believable average HR for the run
+ Run split notification more obvious. I often don't notice Garmin's beep/vibrate
Negatives
- No auto detect workout. Surprised that was missing as I use that for runs as I'm lazy and it is nice in the winter not having to wait for GPS
- Screen less visible in indoor environments. I'm 50+ and soon will need cheaters.
- If you wear the watch on your dominant hand using the wheel will be more of a challenge. I switch watch handedness during the summer to equalize tan lines.
More time and activities Positives
+ For single track trail didn't lose signal on steep woody terrain
+ Battery life seems to be as advertised -- crazy good
Negatives
- Events don't sync with app/website automatically
- No pickleball or yoga activities
- No real feel temperature for activity. Living in the upper midwest real feel is more important than air temperature. Is it a blustery 20F or a comfortable running one? Is it a pleasant 80F or a chew the air 80F?
- No gear tracker. I retire shoes by mileage. I'm using a spreadsheet, but if you aren't you're SCREWED
- "Burn" mark from the heart rate sensor that is still visible a week later after switching wrists. It doesn't hurt, but I can't imagine that being good long-term.
Swim
Heart rate for swim which is something. Also has water temperature.
For a 25 yard pool my swim was clocked in at 1 length short, which is similar to the Vivoactive 4 where it is plus or minus 1 length.
Update: On my dominant hand results are accurate, but on my other hand it seems to undercount lengths by 30%
Buy If - Battery life is important
- GPS accuracy is important
- You want a slightly more accurate heart rate
- Want to save a few $
Avoid If - Like Garmin infrastructure
- Track your gear
- Use auto-detect workout
- Like real feel temperature
- Like auto sync workouts
- Do "strange" activities such as pickleball and yoga
- Need to edit your activity. I forgot to hit stop and my drive home from Pickleball was included in the workout. No way to truncate the workout within the app or website.
I am glad I made the decision as the interface has grown on me, but it definitely isn't perfect for how I use it.
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Swim - Bike - Run the rest is just clothing changes.