Good to have your company, Manningham. I don't know the ZZ, but when you find your way around, you'll find many contemporary ebooks offered DRM free. Something you might find useful is the excellent and free Calibre Library Software thousands of us here and more than a million other ebook-readers swear by. Download here:
http://www.calibre-ebook.com). Calibre will automatically store and catalogue your library as you acquire ebook, but there are other handy features. One is the 'Get Books' button that will take you to a list of publishers and titles anc clearly flags those that carry any form of DRM software padlock. Luck, happy reading and best wishes. Neil
PS: Personal choice and I don't want to start a range war, but I'd say you couldn't go wrong with Sony if you decide to change your device. N