I did rush twice recently, the first attempt being unsuccessful.
First time: I went on a Saturday hoping to get Evening tickets. We got there at 9am and were probably 4th or 5th in line. When the box office opened, they sold only 2 matinee tickets, and 1 evening ticket - that's it. No more rush tix. This was BEFORE Tony noms
Second time: got there at at 9:20 this past Sunday (box office opened at 12). 3rd in line. This time they seemed to be selling more, but I'm not sure how many more because I didn't stick around.
Bottom line is: it's important that you be close to the front of the rush or you risk not getting tickets. I agree with the previous poster that the leg-room is horrible. I'm also not a fan of the Golden rear-mezz because it feels really far away, but it was a great show and well worth it (plus I brought my binoculars)