available on their excellent site. What I have heard and seen is superb musically but also visually with a lot of variety in the images perspective. Be careful, they are available only available for a short period. Do not miss the Tchaikowsky cycle done by Gergiev and his Mariinsky team.
Is there any real need for studio recordings when you can have access to these documents ? Concert halls are the future of classical music recordings.
(PS for techies: these videos are in Flash which means that they would not run on future Ipads.)