Instruct: Classify a given review as either positive or negative.
Query: Elixir Disappoints

I play at least ten hours a week, and typically change strings once a month. They get thoroughly cleaned after each session. Thought I'd try the Elixir strings (mediums) to see if they'd hold their tone better between changes than what I had been using. The experiment was very disappointing. When new, the tone wasn't as full as it was with my regular (much less expensive) strings, and what tone there was began to deteriorate in just a few days. In fact, the high E string already displays rust spots. After one week with these overpriced, underperforming strings, I'm changing back to economical, great sounding D'addario nickel mediums tomorrow.