Yep, I have one of these. I never go anywhere without it.
Its also the tool I use when/if breaking a chain in my "workshop".
Very flat and compact.
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Have you ever had a chain fail on a ride? Fortunately, I have not. On one occasion, though, I did notice a cracked outer plate on one of the links right before going out on a long ride. A failure on that ride would have left me stranded.
You always need a chain tool when your chain fails. I think it is not even possible for the chain to fail in a way that the broken links fall out, making space for the quick link.