I really enjoyed them, they delve in to who put the silo there and why, which I thought was cool.
The 3rd book is probably the weakest of the trilogy but still worth a read. I did read them all back to back though, I don't know if that made a difference.
How did you find the second and third books in the Wool trilogy?
I liked the first but heard that the others weren't as good so not got round to them yet.