I was intrigued enough to buy a tube of this stuff when I saw it in an outlet store here in PA. I've used it twice but I'm not convinced I'd buy it again. I often use concentrated tomato paste in my sauces. I also use concentrated anchovy paste. I think either of those two products would create the same umami "flavor bomb" as #5. That said, I haven't tried #5 as a meat seasoning or as a condiment, as suggested on the package.
I'm curious to know if anyone has used this product. If you have, how did you use it and what did you think of it? Do you think it's useful, or is it redundant, given the other ways in which you typically "umamify" dishes you cook?