
I appreciate Stirner more as an influence than as a thinker in and of himself. Rational egoism is very easy to claim, by a devious enough mind, as a reason for almost anything if one's self-interest is broadly enough defined, making it somewhat useless as a concept.
I do share his scepticism regarding social institutions, but I also think he doesn't take it far enough, by stopping with the individual ego. I also think that while those concepts are certainly false, their outcomes are, at least in some cases, more preferable than anything that would come out of his own prescriptions.