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Stoo61
They supposedly can help your tyre stay seated if you have a massive blow out (see some of the explosions at paris-roubaix this year where riders didn't use them). You're meant to be able to ride home on them too but would be quite rough.
My limited experience with them also seems to suggest that bigger holes seal up slightly better as they stop all the air rushing out in one go (less air rush gives the sealant more chance to block the hole).