Got this to replace my old M600. The main reasons to upgrade were to get a better battery life and more accurate altimeter, both of which work as expected. Battery life is easily good enough to record my longest cycling rides even when it's only partially charged. Altitude information is accurate. Some unexpected issues are: * After switching to the Grit-X I found that the Recovery Status view had disappeared from Polar Flow. This is the view I use most. It's been replaced by something calls Cardio Load, which I find useless. I've seen it go up from "maintaining" to "productive" after sitting at my desk all day, and go down in the other direction after a much harder than average workout. Mathematically I get why this happens, but it's just silly. Polar says that Recovery Status will come back if I link another M600 to my account... (gave the old one to a friend) Sure, I'll go buy another watch and leave it in the box just to get that view back. * Polar support: On Facebook, which I guess is outsourced, they respond quickly, but can't really do anything for you except refer you to their support page. Messaged them there a few weeks ago and never got a reply, which isn't the first time. When my M600 had issues getting a GPS fix I also tried contacting them twice and never heard back. But I later discovered it would usually get a position after a reboot so didn't bother to contact them again. * Heartrate in the pool is often way off. Normally it should be in the 120 range while swimming, but the Grit-X often shows 150-170 throughout the whole swim. I did notice that I seem to get better results if I loosen the band quite a bit and place it closer to my hand instead of the recommended 1 finger space between the watch and my wrist bone. But still it seems very sensitive to getting the placement and band tightness exactly right and it will still go off track from time to time, also messing up the Cardio Load graph because a casual swim suddenly looks like the hardest workout I've ever done. This is really disappointing because my old M600 just always seemed accurate in the pool. I'm still hoping this could be solved by a future firmware update, but currently HR in the pool is very unreliable.Read full review
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: Pre-owned
Very good product
Verified purchase: Yes | Condition: New
I would recommend this watch!
Verified purchase: Yes | Condition: New
Excellent product
Verified purchase: Yes | Condition: Pre-owned
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