I bought this for playing the harmonica and the guitar at the same time. And I've been able to do that just fine.
Now I don't play like this a lot, but I occasionally may play on the street. It's really easy to operate and changing a harmonica can easily be done in few seconds. This gives you more time for playing and the people listening to you won't have to wait for you to hassle with the setup.
The reason why I don't give this product full 5 stars is because one of the pegs holding the harmonica in place was a bit loose. I had to fix it with a rubber band, so not a big deal. This harmonica holder is really cheap and any problems you may have are easily fixed, since it's so simple in design.
I recommend this product highly if you think you may have any kind of use for it. It's fun, it's cheap.