I’ve found that Elixer’s are the absulute best when it comes to tone and long life. They are a bit expensive though, they list for about $26 a set. But, aside from the price, these are the best I’ve played ever. Mine last around four to five months, and I play alot! The tone is the same for the life of the string, bright and well-rounded thanks to the polyweb coating on the wound strings. I’m sure they can easily last longer than four or five months but I like to change my strings regularly. I highly recommend that you check these out.