I've read the first five. I enjoyed all of them but they started to wear a little so decided to come back for more after a break. I like that they have both humour and the occasional serious streak - often in the same breath.
Of course, anyone expecting conventional time-travel rules (hmm, did I really just write that?) is going to have difficulties. I admit that I had difficulties, at first, in the jump from book 3 to book 4, but it settled in okay and I ended up liking what it added to the story.
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