Has anyone got/had/used one of these before now?

I’m thinking about buying one to aid my training.

I’ve had the Zephyr HxM for about 18 months, and used it without any issues with several different Android phones.

It’s been pretty much flawless, and far better than the Garmin I owned before.

It doesn’t loose connectivity/readings even with poor contact, and the charger contact system it uses (giant press-studs) seem to make it pretty indestructible – I’ve ran/biked in some proper nasty conditions and it still goes on.