I think a lot of Americans and Canadians make the mistake of thinking that simply because something comes from Europe (or Holland) that it must automatically be better for growing cannabis. I'm not saying that House and Garden aren't good nutrients, I just don't think they're anything special.
Compared to something like Advanced Nutrients they just seem very dated to me. Cutting edge for last century, but I don't think House and Garden has made any real improvement to their nutrients in a very long time.
Like I said, you can do fine with House and Garden but personally I want to do better than "fine" so I stick with something more "advanced". Hehe