Good if you know how to drive like your parents already let you drive, etc, but bad if you never drive before.
They ok if you get to drive with your parents or friends, because if you already know how to drive - then they will teach you the rules for safe driving and passing the test.... But they have no patience and not very helpful if you try to learn "from scratch" and never drove before, because they expect you to drive flawlessly in couple of lessons - and they will correct you very hard every single time when its bit far from perfect... which makes some people, like me, afraid driving...feel like I was never learn and should not drive.
I took lessons from them year ago, and didn't pass my test and actually start afraid driving.