Some clear advantages to the circuit-switching technology make it well suited for certain applications. The primary advantage is that after a connection is established, there is a consistent and reliable connection between the sending and receiving device. This allows for transmissions at a guaranteed rate of transfer.
Like all technologies, circuit switching has downsides. As you might imagine, a dedicated communication line can be very inefficient. After the physical connection is established, it is unavailable to any other sessions until the transmission is complete. Again, using the phone call analogy, this would be like a caller trying to reach another caller and getting a busy signal. Circuit switching can therefore be fraught with long connection delays.