They corresponded with me by E mail, asking the same questions over and over again as different people took over and then, finally, told me they only worked on fife alarms that went with security systems and I should call an electrician. Waited 10 days for that duh advice. Waste of time.

They delivered the central vacuum equipment ($400.00), activated the security alarm system and made some rudimentary suggestions for a sound system but such recommendations were limited only to what they had in their inventory and were not creative about what I needed.  In other words, their approach was ... we have this high end inventory and can give you a good price on it without regard to our needs.
My biggest complaint is that, despite purchasing $400 in central vacuum equipment from them, they tacked on a $125.00 service charge for coming out to the house.  When I ordered the equipment and requested the service, Kevin, the Dispatcher said nothing about a service charge and I think it is completely unreasonable to assess an additional charge at that level essentially for delivering the equipment.  Had I been informed about that, I could have driven to their location and picked up the equipment.
Despite my attempts to have the service charge retracted after the visit, they declined to do so ... unless I purchased some of their sound system equipment and services, in which case they said they would give me the first hour free.  NO THANKS! 
I will never do business with A to Z Integrated Systems again and advise that you not do so either.