well I don't think it's all that transforming since it's a bit limiting in some situations.
It's only best used for picking on one string or doing 3 or 4 notes per string runs, not too good for sweeping since you can't tilt with it.
And for those who like to tilt their pics for all types of picking it doesn't work either.
But it does teach you about economy of motion when picking, and it does that very well.
I just think of it this way, $10 to improve your picking even by a little bit is totally worth it.