these are the ones http://chessok.com/shop/index.php?main_page=product_info&products_id=509
A. Panchenko - "Theory and practice of chess endings"
I've seen them, looked through them. Can't say that I've read them, though.
Similar level to Dvoretsky's Endgame Manual, I would say. Like Dvoretsky, they have a number of exercises, many of which are quite hard. They also have some nice examples of practical endgames.
Yes, I think they are good books, and some strong Russian players have made very favorable comments about them. But you would need to be pretty ambitious to go through both volumes.
If you already have Dvoretsky's Endgame Manual or Muller/Lamprecht's Fundamental Chess Endings, then I wouldn't bother.

I don't own any of those other books... the only engame book I have is Silman's. Are panchenko's more advanced?
Yes, Panchenko's books are more advanced than Silman's book. The explanations in Panchenko are not as detailed as to the ones in Silman, so you have to think for yourself more. Also, there is a lot more endgame theory in Panchenko than Silman.
I would guess that Panchenko's books would be good for players rated 2100 through 2400, although a lower-rated player who is willing to put in the effort could also get a lot out of them.

You are welcome Retrodanny. I hope that you downloaded the free lesson.
has anyone here read these books? I heard they might be good