Fast and smooth. However, because the voucher indicated I must have two empty spaces in my breaker box to accommodate a new surge protector, I thought that meant I could monitor the surge protector's status simply by looking at the breaker box panel. Instead, the protector was installed behind the panel and panel must be removed to view protector's functioning status. Because the voucher stated I needed these 2 extra spaces, I had assumed it would installed just like one of the breaker switches where it could easily be seen. So, I'll have to manually remove circuit breaker panel after a direct lightning strike to ensure it is still functioning, which is a bit more than a little inconvenient.