I am going to get tickets for my boyfriend for a broadway show that is having "preview" performances the month of April. The official opening is April 27th...I was wondering if anyone has ever been to a preview performance before? I know it is used to fine tune some things and get an idea of what the audience likes. But for theater goers out there...do you recommend to wait a little bit to see a new show until after the preview? Or is there not enough difference to worry about it? Any info would be great!!