Welcome aboard...we're proud to have ya!
'Buck and ball' is a very old concept used centuries ago in muzzle loaders, and the concept apparently worked fine back then. I have no idea if this current loading is any better than standard Buckshot or not, but I am pretty sure it would get the jib done if the shells are reliable.
Still, given the advances in modern shotshells, especially the newer Federal Flitecontrol loads, as well as the fact that you can buy Buckshot locally to train with and verify reliability of those specific loads in your, specific shotgun (something you really should do for a defensive firearm) I would not bother with 'exotic' stuff unless I was just curious. Even then, I have no idea if the manufacturer would stand behind their ammo should you bugger up a shotgun while testing it. All major US companies and several foreign ones as well have track records of QC and reliability with premiun shotshells. I cannot say the same for the 'exotics' sold in various places and loaded by God only knows who.