I had one on my SKS for a while, I did not like it at all, not only is it very long, but quite heavy. I put mine back to it's original configuration.
I don't really like most of the SKS modifations out there, I have practiced with mine quite a lot, with the fixed 10 round magazine and quality stripper clips, I find the SKS to be pretty effective in it's original configuration. With the correct sling and bandoleer it is definately worthy of it's title of battle rifle.