Does it work good.  Any feedback?  I don't think you can use a sidesaddle with it.

No I don't think you can use the side saddle shell carrier.  You have to use a compact style foregrip too.  All in all it's decent stock. I wouldn't want to shoot buckshot or slugs from it though because it's just wire against your shoulder.  It's very fast to fold and unfold.  Only complaint I have is that when it's extended it does wobble just a little bit.  Any other question?
Hope this helps