Craytab pretty much nailed it.
The only thing I'd add is that Sal, himself, has chimed in to say that H1, when serrated actually holds an edge better than ANY other steel they have tried, including all the exotic super steels that Spyderco played with. Right now I only have one H1 knife, and it's a PE. It takes a screaming scary sharp edge, but it does lose it quickly. The serrated... I think I recall reading somewhere that the serrations are actually 68HRC or something crazy like that. I don't have citation but I'm sure someone here has or can find it.
I can tell you that Sosa's experience is singularly unique. People go bonkers, in my experience, over the edge holding of SE H1.