This is quality! Solid, well made and most of all, easy to use for those quick key changes, without all the clunking noises which can be so embarassing when under audience scrutiny.
There are cheaper units but don't buy them and then gradually upgrade. Buy the best first and don't make the mistake of compromising, especially at the Amazon price!
If you are unsure, look at the videos on You-Tube and watch the demos.