One of my staff brought this to my attention about a month ago. I have mixed feelings.
I think for an experienced guitarist this might be a way to aid in a kind of mental practice. This is proven to be helpful in sports, and sometimes as effective as actual practice.
For a beginner I’m not sure how much benefit it will be since you can’t actually hear the notes. There are so many subtle things going on in the beginning that you need to know based on the sound.
If possible my preference would be to have a small guitar that you could take around for practice like the Yamaha JR-2.
On the other hand if you really can’t bring even a small guitar where you’re going I think this couldn’t hurt… And it’s pretty cheap.