Yes, having it since 6 months now and I'm extremely happy with it. Comparing with the previous model replacing battery won't destroy the slot. Can definitely recommend it.
The Huawei Smart Watch GT2 already measures the pulse on the wrist. But since it is Bluetooth-enabled, a connection should be possible. You could probably also connect the pulse sensor to your mobile phone with an app. However, I use the Polar M400 and the Polar Flow app with the heart rate sensor anyway.
The manufacturer of my device said that the Polar H9 does not work. I checked with Polar. They said it would work. In fact, it works wonderfully with the Polar app.