Useful but a bit buggy
Seems to slow down at times waiting for something to happen. Once you are used to it it’s a good way to learn to read the notes and to learn their positions on the neck. When you select a specific string to practice note positions you seem to be able to choose any of the others which I suppose is fine but a bit confusing. Might be best to grey out the other strings to force you to find the note positions on your chosen string. Just a thought