I bought one of those vegan Spam-a-likes and I have to say I really didn't like it.
I my thought process was "Spam's so heavily processed, how much worse could it be if no meat were involved?" the answer turned out to be "A lot." I don't know how to describe it. It's like... you know how there are all beef hot dogs, but they don't taste anything like beef? It was kinda that but with Spam... but Spam isn't very meat like to begin with.
All that being said, after the plant based Spam sat in my fridge until it started to get fuzzy, I threw it out for the stray cats in my neighborhood. Despite the fact I found it to be quite unappealing, starving alley cats found it to be meat like enough to eat it... which I guess is a mark in it's favor?