Black Goose Slugs

I just bought a pack of 25 black goose rifled slugs. I then came home and googled everything I could find about this company and there’s essentially nothing online about them. The guy at the gun shop just said they’re a Canadian company so I thought cool why not give them a shot.

Are these things any good? To be honest based on their online presence (or lack thereof) it seems somewhat sketchy. Did I just buy a shitty product? Or am I overreacting? Would love to hear from those who have shot these slugs or know about this company which I believe is called Sterling Cross Defense Systems.