I'm an Italian boy, I'm twenty years old and this is the first time I see (and I hear, of course) YES.
During my short experience, this is the best live performance I've ever attended because of the music and the musicians. I want to say that the other features of the show (lights or mixer equipement) weren't remarkable, they were essential and no more (other bands want to attract and to amaze with special effects: music is important, the rest is extra).
MUSIC WAS PERFECT! YES put their attention on all kind of sounds: Howe changes 3 or 4 guitars in every song, Squire plays a three-handles bass guitar, Koroshev uses different sound in comparison with Wakeman with excellent results, Sherwood is the member that remains on the back but you can do nothing without him, White seems to be a contemporary of mine, Anderson is divine!
I liked a lot the sounds, expecially in the historical songs (Awaken, And You And I, I've Seen All Good People, Perpetual Change). I enjoied a lot even 90125 songs, like Owner Of A Lonely Heart, and Hearts in particular was exciting! I think that Trevor Rabin can be sostitued (not in the composition), but no one can replace Steve Howe in playing guitars.
I cannot consider Koroshev as a substitute of Wakeman or Kaye, because he can define his style and variates all the solo parts.
New songs are not like the past masterpieces, but they represent the sign that YES still have a lot to say. They can delude their fans very difficultly!