I went to this show in July and the volume was fine. I was in the fourth or fifth row, center. Loved the show. Like Greg said, not a "mighty" production, but lots of fun and excellent dancers. For those of us who truely love everything Vegas, it's a historical review of our favorite city. For just a passing tourist, it's a nice show.
I bought a Groupon ticket for about $40, then upgraded to VIP at the box office solely so I didn't have to stand in the general admission line for an hour (I had burnt blisters on my feet in the hot Vegas sun). The VIP seats are certainly not needed for sight-lines, but it was worth the extra $10ish I paid to just show up at showtime and go to my seat.
Enjoy the show!
diane