I own every Yes DVD to date... Montreux is good, but not as good as I hoped it would be. I may have over-hyped it a bit in my mind. I was really looking forward to this release which is basically the same concert that is contained in the Yesspeak "concert slideshow." Unfortunately the sound on this release isn't much better than the Yesspeak version. In addition to the audio letdown, the band just didn't seem to have the energy as they did on the 35th Anniversary Tour. I haven't seen or heard a Yes recording yet that does justice to how powerful and energetic they were playing at the end of the 35th tour. Steve plays well, but doesn't really get animated playing until the end of the concert. In Tsongas, he actually looks like he wants to be there and really rocks. Jon's voice seemed off a bit, they hardly showed Chris, Rick looked good but was back in the mix, and Alan was hardly audible. The recordings of "Southside" and "And You and I" aren't as good as on Tsongas either.
That being said, there are many positives to this recording. "Don't Kill the Whale" was energetic, the solos are fantastic (I've seen Steve play "To Be Over" several times live, and this is the best I've heard), and Awaken is extremely powerful, especially at the end.
All in all it is certainly worth buying, but I would recommend that you buy Tsongas, Symphonic, and An Evening of Yes first if you are looking for the best overall product.