I change my strings ever month or so. I play a lot, but not for long periods at a time. For acoustics, I swear by Cleartones. As for Electrics, I've chosen GHS because they are the cheapest and made right here in Michigan.... Their tone is good and so far I like them. Dean Markley's are my usual choice prior. I've been through D'addario and Ernie Ball. Neither appeal to me.