Have you tried the Gergiev recording of no 15? It's amazing.
No, but I'll look out for it now. Gergiev and Shostakovich is a special combination for me - http://www.barbican.org.uk/music/event-detail.asp?ID=3750 was the very first concert I was well enough to go to after being too ill to go near a concert hall for years. After hours of gentle coaxing by the Wonderspouse I was persuaded to go, and he booked seats right by the door so I could escape if I needed. It was a great first concert back!!