My F5 started out strong, but after a couple weeks started giving me very similar problems that I had with my F3HR and my F3. Seems these same types of problems just keep following to the next device, and I need something I can depend on every time.
GPS seems better than the F3HR & F3, but distance seems a little short compared to known distance.
Pace is very jittery, not that I participate in races or anything, but having an accurate pace is certainly a good thing.
VO2max seems way off. Says my fitness level is poor. Every other (non Garmin) device I have used that measures fitness level tells me that my fitness level is at least in the good range.
Certain setting set on the watch never get saved to GCM and next sync they sync back to what GCM has set.
VO2max and other performance stats either never update in GC or update with different numbers that are on the watch.
Activities get lost in GC after saving and GC says it cannot access the activity. I actually have to connect the watch via USB and import the file from the watch to get the activity into GC. This happens just randomly.
Calories burned are sometimes less than half of what I get for the same activities I get using any other device.
My F3HR has lost several workouts. While saving the activity, the watch rebooted and totally lost the workouts. I feel like it's just a matter of time before the F5 does this as well.
My F3HR got so bad that I could not trust doing an activity without wearing another device as a backup, and I have grown to not trust the fenix line because of this.
The thing that gets me the most is that this could be such a great device if everything worked on it, and it was dependable.
I need something I can rely on so I returned my F5 to REI and got a Suunto Spartan Ultra. I had this device before but returned it because I was so excited to try the F5. Now I know I should have just kept the Spartan Ultra.
Sorry Garmin.