Smart Home Installation (thermostat, door bell, hub, security )

[Dani Beit-Or]

Hi, 

I'm looking to install smart home devices in two of my houses. Nest's package is about $2k.

Wanted to know if any one has experience w/ Nest, and if you know of other providers that have a variety of items for a smart home (and not just the security ones). 

Also, if any one has experience w/ using items from different provider (google, nest, ring, Honeywell, etc.)  and if they all work together /communicate? 

TY