Just saw One last night and it was an amazing show. Tickets were pricey, so I bought the 3 corner tickets for $75 each and the view was perfectly fine since the theater isn't too big.
Don't want to spoil any surprises by talking about any specific scenes too much. I'll just say its a really well thought out production and ode to MJ. More focused on music and dancing than other Cirques, also more modern techniques and effects than other shows. Cirque really showed an evolution in their vision and captured the spirit of Michael well.
Only other "musical" Cirque I've seen is Beatles Love, which I liked, but like One a lot more. Highly recommended!