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Mostly they are slow and unreliable. I've been to several events where there were Blink chargers and about half the time the Leaf owners have to call Blink to report an outage. I have the card, just in case, but I've never had to use it.
I agree, I have the card in case I need it when I'm traveling, but I have only used it twice in two years. If you ever plan to use a Blink charging station on a trip, you should have a backup plan in mind.