I like how easy it was to set up and use. The customer service/support has been excellent. Nothing so far. However, I did receive a few warnings from the software during setup for certain features. Do your research before purchasing a solution. If you have an existing building control system, this will not work with it. You need to have a completely separate HVAC system or be willing to purchase a stand alone system. This allows you to control your HVAC system without having to wait on the weather forecast. We are saving energy costs by keeping our air conditioning down at night.