Alasdair

Was not enjoyable.

 Beautiful but a little confusing - world built as you go along but the wider context was slow, and felt lost quite a lot. But the development and the love story was beautiful. 

excellent fun!

It's hard to give this one a rating. If it were to have come out recently I'd say it wasn't a great book, but it came out in the 50s and as such you can tell it will have broke new ground, and seems to have done so in a way that hasn't been carried forward in tropes from the genre. Interesting enough to keep me reading, so 4 stars seems fair enough.