There's been many discussions about the sweet stick type devices on this site. Many people say it ruins your edge and it's a no no. A few have said it works great and if used properly, it wont ruin an edge. Personally, since I've bought the Miracle Stone, I put away my sweet stick and I get a lot more consistency in my skates. What I mean is that I don't get those random moments where my skates just slip under me.