I'm not a big fan of these products because I don't miss meat at all, but I think they can be a useful tool for those wanting to be vegan for ethical reasons. The science is getting so good they are now making things almost indistinguishable from meat, and I think that is a good thing overall.
A few years ago in the USA a friend gave a me a vegan chicken nugget to try, and it was so similar to chicken that I found it hard to eat, but I find seitan is different enough from meat that it's easy to eat.

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