I got one of the W3 watches, it’s ok but a few things I find annoying. You can’t alter the time the screen stays on for – 3 seconds – and it’s quite hard to read in sunlight, so by the time my old eyes have focussed on the info I want to see the screen shuts down and I’m tapping it again to try and find it again. Not many choices in watch faces, not able to change size of text – I wanted it more for HR stuff but that info is pretty small on the screen. Used it during a 2 hour ride yesterday and it tracked no distance or calories used, so looks like the gps/tracking isn’t working, I know it’s on as I also used ViewRanger, the calories used I have no idea about that, but it did track time and HR info. Settings also very limited, nothing for gps so I’ve no idea if that’s on or not on the watch or linking with the phone or any way of testing it. You have to download an app for it to work with which again is a bit basic, it wants permissions for everything otherwise it won’t work, and it’s always on. Won’t work with any other apps – Strava, ViewRanger, as far as I know – my Sony smart watch has other apps come up on the screen that I can select and use.
Otherwise it’s ok, HR tracked ok and the information was interesting, probably not accurate but ok as a guideline. Sleep info was interesting. Maybe some of the things above could be address with new firmware, most annoying thing is the screen time. But for £25 it’s good. Would be interested to know if other fitness/HR type apps would work with this though rather than the one you get a link for.