Well my machine didnt come w. instructions so it was hard to learn. but after messing around a little bit and doing reseach I found it very easy to use. IF you are a every day player who likes to have well tension strings every day but dont have the money this is it!
The machine costs not too much. I save $51 every time. I string myself because I have 3 rackets.
I also string for my friends who play alot, and the 5 to 10 bucks here and there pay for my strings!