I have had a set of TI flats on my bass for about seven years. Over the last couple of months, while practicing at home, it seemed like I could not hear the notes clearly, especially on the E string. Seven years is a decent amount of time to have them on. I was just wondering how long some of you get out of them before you decide to change them. Granted the amount of actual playing time is crucial, but I just want a rough idea. I have just put on a new set and they sound very clear. I realise that it will be a while before they break in. Only then will I know for sure that changing them was the solution.