I used this for my flute. It was okay, except for the fact that every time you'd get a note wrong the amount of questions you had to answer would skyrocket. I had been doing questions for HOURS, and I was stuck on 85 percent accuracy and I'd already answered about 90 questions. It took me at least ten more for the percent accuracy to go up ONE PERCENT. I just don't like how every time I get one tiny question wrong it gives me at least twenty more questions to do, which I know is just to help maintain my score, but it was JUST ONE INCORRECT ANSWER, and it takes a HUGE amount of time to get your score up by one tiny percent. But otherwise, there was nothing wrong with the site and it was okay.