A turning knob is not the best UI for channel selection. It is a traditional one, but even my grandmother's large box radio, that must have been manufactured something like 70 years ago (not a transistor one, mind you!) had push buttons for remembering the stations. (Besides the tuning knob.) Or maybe those were 'pre-programmed', not sure.

But again, if you didn't like them and had this gadget (or wanted an excuse to buy one ;) ), then it's the better solution. I was mainly reacting because it seemed like a lot of people thought that this is a generally practical solution.