I have some and like it a lot. It gives slightly tighter than usual (for standard velocity #000) patterns out of my 870Ps and recoils less. Can't say about penetration, but I never had a problem with penetration from any #000, and the plated, hardened pellets should do just fine.
"Normal" #000 patterns for my Imp Cyl guns run around 12" at 15td. and 18-20 inches at 25yd. Cylinder bore guns give wider patterns, but it has been a long time since I shot #000 in any of them. I do intend to use this load in my Norinco M97 Trench Gun replica, but have not tried it yet.