We attended to go and see Mamma Mia and were not disappointed. The theatre is just off Times Square at the side of Ellens Stardust diner (tried waiting for this and gave up after a hour in line with no movement). Seated in the stalls at the front we had fantastic seats and really enjoyed the show, the sound was great. The theatre was prebooked before we travelled so wasnt cheap, around $136 per ticket but you could chance your arm on Times square and try to pick up cheaper tickets, the best seats go first however so dont expect to get front row for $50. Good clean toilets and refreshments available half way through. My only moan would be the seats seemed a little small.
