From what I heard from people, don't! The horses are below you so you miss some of that AND, people will be on their knees because if you sit, the panel blocks your view even further.
I saw 3rd to last row in the balcony and was fine. It's not like Xanadu where you literally are, or were

, on stage
I once heard someone describe her (Ruthie Henshall) singing as sounding as though she's trying to swallow a whole meatball slightly larger than her windpipe. (The same person compared Michael Ball's singing to sounding as though he's sitting on a washing machine on spin cycle and Colm Wilkinson's to a man with a paralyzed lip trying to eat cottage cheese.) --- Schmerg_The_Impaler