I read The Ego and It's Own some time ago. From what I recall, it was an interesting read, once I managed to get my head around Stirner's ideosyncratic rhetorical style. He tends to argue from a multitude of viewpoints simultaneously, often obscuring the actual point he is trying to make.
Nevertheless, some of the terms he introduced are quite interesting, his 'Spooks' in particular. It's rather a shame they didn't catch on.