Well written and the characters are brilliant. Invented an interesting society.
I think my favourite are Agent of Change and Plan B, but I like all of them. Some complex issues handled with a lightness of touch. The whole matter of identity and being changed by your job.
Yes, definitely pick-me-up books.
Looking forward to reading the new ones - and hopefully getting hold of I Dare. I bought from Meisha Merlin on most of them. Didn't buy quite far enough of my reading and missed buying I Dare - which went out of print and was up to £45 for a second hand copy the last time I looked.
Crystal Soldier duality is fun - interesting to read such a well crafted prequel.