Played 14 gigs on consecutive nights in sweaty summer heat - ditto with back to back festivals, and the newtones survived brilliantly. Like any string you MUST clean them before you put the instrument away - Dunlop liquid is the only stuff that actually works properly by the way (forget fastfret), and the newtones score because they have a round core, so you only need to clean off the dirt from between the outside of the coils. ALL other strings have a hexagonal core, meaning you have six slim slots the length of the string that soon get choked with sweat and grime and stop the string vibrating properly. Anyone who feels newtones don't last is probably not bothering to clean them. Mind you - any other string will be much worse for dirt, but the brash metals used in most other strings (newtone have a unique metallergy too) give a harsh sound which is probably disguising the deterioration due to dirt for some ears.