Bought some at IW and have used them 4 times now. What a difference they make. I have nexus skates which were the only ones that passed the pencil test for me. However,the room I had in the tops of the toes was way too much. With the shim in place all that space is gone now.
I have noticed one strange thing. Where I used to have lower back pain after a skate,I no longer have had any after using the power feet.Just hard to explain but not complaining.