You can even buy their pre-installed box, ready to go.

It has some warts, but my automation would not be viable without it. I specially like the NodeRED integration - even if I think that NodeRED is quite quirky and %#@!% sometimes, it's still neat to be able to write automations without programming much. I do plenty of that on my day job. Also a great visual aid to explain to non-technical people.

I run this too, nothing but positive things to say. I update it every once in a while, but I has been rock solid for years.

Any tips for those who want a simple stable setup?

Lutron Caseta. I personally like ZWave/ZigBee stuff more because it's more configurable and open, Lutron cannot be broken, even if you try.