That all sounds astounding, but the kicker is this: the etudes sound GOOD. They don't make my ears bleed, my head pound and my lungs freeze just to hear them. In fact, they're enjoyable to hear. Musical, even.
Inspired by his perfection, I have now set off to perfect my own etude. Hopefully my thumb will last through all those octaves!!!
And for your listening enjoyment: One of the most beautiful Popper etudes - #13.