These are great when they work. Unfortunately this is not always the case. They work just fine on my relatively short commute rides with close to zero elevation gainloss (26.6 km). So far there were two cases when power simply stopped being reported in the middle of a longer ride with some climbing (90km with 1500m of elevation gain). The other problem is that these pedals also report cadence, so once they stop working you loose that too. I use Wahoo Elmnt Bolt as my cycling computer, which may add to the issue, and in fact I'm not 100% sure which of these actually breaks things, but I tend to believe the problem is with the pedals, because I have not experienced any issues with the Bolt.
On the good side these are very easy to install and set up, the phone app that controls the pedals is easy to use and intuitive, and pedals get discovered very quickly and with no problems.
I've had all sorts of problems with my Garmin computers communicating with my iPhones over the years, but one thing that has never given me problems is my Garmin heart rate sensor. It has worked flawlessly for me.
Well now I can add another to that category. The Vector 3s synced with my Edge 1030 first time and every time. It was easy to install, and so far, no problems.
The one thing I wish Garmin would do is provide online videos on how to use their product show to get the most out of them, how to make use of less well-known features. Instead, the videos on their website are promotional only, and no use to anyone who already has their product. Instead, it is left to third parties on YouTube not only do you have to search for these things, but with new products they don't even exist.
Changing batteries is the worst! Sometimes the unit works and other times it doesn't.
