I would probably keep it, and just not do it. Eventually I'd realize that I never do it and get rid of it. Keeping it for a bit to see if you will ever decide to go back to it could help you avoid making rash decisions - there's nothing worse than trader's remorse!
Like FitNancy, though, if the instructor is *so* irritating that I just want to hurl a dumbbell at the TV, I'll get rid of it immediately.
Kathy
P.S. By the way, Joe, now you've gotten me really curious about what workout this is!