I used my in ear earphones on rehearsals and on gig's they lasted around 5 years, they are very comfortable, and can isolate you from the outside world, the only con I've found was the sound quality that is reasonable, i think they lack a lot of bass so they're not good for bassists, however if you are a guitarrist you'll have good sound quality.
In sumary good earphone, lack bass driver but very comfortable!