Nest products usefull?

[Jonathan Johnson]

Hello BP,

My rental is a single family home that I'd like to upgrade with a nest thermostat. The tenants are great and it's cashflowing nicely so I want to do a nice upgrade for them as a reward of sorts. 

I've been looking into the nest products and think they are great. I was wondering if anyone has put the thermostats in their rentals and any pros or cons to getting them.

Are they tied to a certain phone? If my tenants move out, will I be able to get them off the smart phone thermostat remote?

Also, I was wondering if anyone has had success with other nest or smart home products?