I liked it a lot. It's definitely my favorite Legion story. It was much faster than the other two, and it took an almost horror feel for a while, which was really refreshing and gripping. It very much had the kind of content I wanted and expected from the final book in the series - aspects and Sandra - even if it didn't have quite enough of them to truly sate my hunger. The ending made me tear up a little (twice, by the way, because I beta'd this one, and reread it just a few days ago in preparation for our upcoming Shardcast episode). This is not something I talk about in the Shardcast, because there was never a good time for it, but the Legion stories have a very special place in my heart. I don't have any mental conditions, but I've always been someone who puts a lot of value in the mind, so ideas like losing memories, or skills, or seeing things that are not there, or changes in perception, all of these things affect me strongly. The idea that I can know or do something one moment and then lose it is terrifying to me. I don't really do with my hands, I am not a physical person, so my mind is very much all there is to me; so losing aspects (sorry) of it is just... ungh! So the ending felt really really good.
Also, @Mark Lindberg found this, and I like it very much: