These do what they say, although I gave a 3 because they will not stay open unless you hold them in an awkward way. They do a great job of scratching off the lottery tickets, but the closing or attempting to close is aggravating.
They work really well. Altho, I'm thinking maybe they will get dull after a short while. I have only used it maybe 5 times, and so far, so good. Could be a bit less expensive - if they wear down after a few uses...will see!