I did rush last Tuesday, getting there about 45 minutes after the box office opened, so I'm assuming the best rush tickets were already spoken for. I was offered either row D, a partially obstructed orchestra seat on the left side for $45 or an unobstructed back of orchestra seat.
I took the partially obstructed view ticket, knowing I might regret it and somewhat did. There was a lot being shown on a projection screen behind the actors I missed, and any time actors were to the right or left of the riser in the center of the stage, I could see very little of what was going on.
The flip side is during certain scenes, Ben Platt is singing unobstructed right in front of you, but generally speaking I'd recommend avoiding the obstructed view seats.