Hi, I'm always using my Acoustic Guitar on stage.Guitar Strings are easy to get rusty and broken!! Friends advise me to use the Coated Strings,it can use up to 6 months without rusty and broken. Finally i got 2 pack of 'Black Diamond' with black coated strings.Amazing,sound good but unluckily,each pack i only used for once,the 3rd string was broke after/during the show!! :twisted: Give me some idea,which brand s'ld i go for and do coated strings really that useful??