I've won with him quite a few times now and the few times my opponent let's me use it instead of conceding it's been very underwhelming. I was expecting him to come out of the card or something, not just a ripple effect.
Better presentation for alternate win/lose conditions is pretty high up on my wish list. Most of our time is spent on the “Must Do” list, so that doesn’t necessarily mean they’re coming soon. But, as Rosewater would say, that’s a when, not an if.