I started using John pearse strings a while ago and have noticed a "night & day" difference in longevity and tone. When you first put them on they will seem noticeably squeeky and overly alive, which fits in with most people's comments about them. However, after a break in period, the most pleasant characteristics emmerge. They have a twang that rings out and seems to last longer than any other strings I've ever used. In the past I've used (for comparison) D'Addario, Elixer, Martin and a few others.