I have played the disc both in DVD-A and the 5.1 Dolby Digital version. I liked it both ways. Even in the Dolby digital version, it sometimes frightening as the music builds in volume, and one wonders just how loud it will go. Even my wife can tell when I am playing the Mehta Teldec version, and she normally is content to listen out of a monophonic radio. However, when I play it in 5.1 Dolby digital, it is with a 5.1 speaker setup. Even if the Dolby Digital track is lossy, it's still impressive, and miles ahead of regular CDs. I have yet to hear a CD of M2 that matched the Mehta DVD-A for clarity and dynamic range. The organ is incredible-easily the best I've heard in an audio recording. And it is a driven intense performance like Mehta's earlier VPO one.
Sometimes, I think they must mix the two versions differently. I bought Mehta's DVD-A of Carmina Burana at the same time, and thought it sounded awful-rather muffled and with poor highs and no snap to the brass. I set it aside for a year or two, and then tried it on a DVD video player and it sounded great. However, if you play the track on a non DVD-A player, you also lose a lot of stuff like the librettos, info about the composer, etc.
My DVD-A equipped player was also a DVD-video player. If one played a DVD-A disc, it would not allow you to play it in the DVD video version, and one could only hear the DVD-A track by connecting the 5.1 analog audio outputs to the receiver. I recently upgraded to a HD DVD player, so I pulled my DVD player that also plays DVD-A out of the system to make room for the new HD player. But I liked the Dolby digital or DTS tracks on the discs well enough to do without the other player. I've only got 3 or 4 DVD-A titles, and they do not produce all that many, so i would not recommend getting a DVD-A player with little content available for purchase. SACD seems to be the high-def audio of choicethese days.