I am confused about getting Broadway tickets at the TKTS booth. Can you purchase tickets for all Broadway shows, or is it just certain shows each day? If I am set on seeing a particular show, should I take a chance with TKTS, or buy the tickets in advance and pay more than I would at the TKTS booth? The shows I am interested in are Phantom of the Opera and Rocky. And, are the tickets at the TKTS booth the less preferable seats (rear mezz, etc)., or do they have tickets in all categories?