Isolation transformer benefits?

I can understand how an isolation xfmr can be a benefit for apartment dwellers sharing a transformer with 50 other people, but would it benefit me? I happen to have a dedicated street transformer for only my home. My 3 dedicated audio circuits are all on the same phase. All 120 volt appliances and motors are on the other phase.( Phases a little unbalanced?) Would I hear or see any difference with a isolation xfmr in this situation? Is it worth the time and money? I am poor.