I have definitely improved. However, this needs to be combined with quality practice time on your instrument to see the full effects. Seven and a half years ago I was functionally tone deaf, and though a lot of learning happened while playing music and tuning instruments, ToneGym definitely has had a big impact over the year and a half that I have used it.

Yes!! I definitely improved. For me the secret is consistency

Absolutely!

of course. Just be patient and dont give up