No one needs debate the merits of Firebird; it is one of the great ballets of all time and a worthwhile addition to any collection. I don't like Prometheus as much, but this is a reflection on Scriabin's composing, not on Kirov's playing, Gergiev's conducting, or the engineering on this disc.
In fact, the engineering on this CD is excellent, and the complete Firebird ballet is played expertly throughout. The famous Danse Infernale is driving, and the Finale is soaring and triumphant.
However, this disc does not receive a full five stars because in my mind it lacks a certain "je ne sais quoi." I really enjoy it, but I sense Gergiev and Kirov hold back a little; I sense that they could have taken it to the next level of excitement but didn't. Don't get me wrong; this CD is great, but I just expected more. And one more thing; in the microsecond of silence just before the crescendo of the last note of Firebird, there is a small scratch on the recording. I can't determine if it came on the tape they used to record the performance or from a rustle of paper or a percussionist picking up something in the concert hall, but it just barely mars the most essential moment of the entire piece. I try to overlook it, but it's something small that stands out in a big way, sort of like a splinter or a tiny pebble stuck in your shoe.
Otherwise, this is a great disc which deserves nearly all of the kudos it receives, and I don't know of a better performance to recommend instead.