In the darkness of a club if you want to adjust your volume or tone you have to quickly select one of as many as four knobs - not an easy feat when you're playing. With only one knob to worry about it's a lot easier to use. And there's good reason to use it. The volume knob gives you a host of options in a cranked amp. Set up a good distorted lead tone on 10, then roll the volume back to give yourself a nice crunch or clean sound.
Here's an example. In this short video I start off with the volume on 1, and do a near clean verse of Sweet Home Alabama. I notch it up to 5 for a great AC/DC sound, then up to 10 for some hairy, distorted Neil Young.
Contrast the SE One to this feature-full but mind boggling old Harmony below and you can imagine which is easier to change on the fly.
The PRS SE One is not only a great guitar for the money, it's a great guitar - period. While it's made in Asia to keep the price down, its playability ranks up with any professional guitar I've picked up.