I don't know this piece very very good, but it seemed a bit messy to me. Maybe it was the second piano who played sum wrong notes to. Although, I founda performance from yu on youtube, a beethoven sonata, and i liked it more.

Edit: I really liked your Shostakovitch.
Edit²: How difficult is this concerto? How many pages? I liked it a lot. Was it the first or the second piano concerto?
(For the violinists here, there is a very nice video on youtube of Katchaturyan playing Shostakovitch violin concerto.)