I love z-wave. If it weren’t there 15 years ago I would not have statted with domotica at that time. Wanted to have automatic blind switches only, and at that time I bought zwave.me wall switches (some of them still work today!)
Then I discovered they could be controlled remote and the domotica story began…
Vera Micasaverde was my 1st zwave controller with many addons.
Then 4 or 5 years I wanted to integrate more devices and vera was not fit for it anymore… thus Vera was integrated in Homeassistant (so I dicovered HA 
).
Slowly migrated from Vera to OpenZwave and ran 1 year dual. OpenZwave was high touch and lots of reboots…
And then finally Z-WAVE JS
It has never been so steady ever since I stated using Z-WAVE JS
Having over 80 devices of all kind of brands, ages, battery/mains.
I love it!
Edit: my Z2M network with 37 devices isn’t as stable as my zwave is. Frequently philips hue white & color dropvif the nework and power cycle is the only way to being them back.
And obviously it’s always dangerous to say “these things out loud” lets hope it now remains stable🤞