I've tried a number of vegetarian products that tout themselves as being "as good as meat." They are almost universally so nasty that I can't keep them in my mouth for more than a few seconds before hurling violently.

OTOH, there's some stuff in the chinese market called "mock duck" which in the ingredients is called "braised gluten." This stuff is *really* good. I used to eat it all the time with noodles and even prefer it to chicken sometimes.

I'm not familiar with the term seitan, though.