Welcome to the forum. I see your sig says you have a Kindle but I guess that is 'to be determined later' in baseball parlance.
If you do go with Cybook then by all means check out the NAEB thread
https://www.mobileread.com/forums/showthread.php?t=21749 I ordered mine through them and saved $75 off the Bookeen price.
You've probably seen this page but if not check it out for all the detail in the world about these devices:
https://wiki.mobileread.com/wiki/E-book_Reader_Matrix
I understand the Cybook is so small it will fit nicely in a ladies purse. Either device is great and you will be pleased whatever you choose.
I sent you a personal message with some links to books you might find of interest. This is a great hobby and very addictive.