I've been using these for quite some time. in my opinion they should be standard saxophonist equipment. Keeping the mouthpiece as new and they have a good "feel on biting" on it, specially if you use metal mouthpiece. Only con is that they are a bit finicky if you miss the perfect center and if you peel them off then stick it again, it wouldn't look so nice and blended in. Also, to someone "V" for Vandoren written on it would be a bit of a nuisance to look at.