I have the Kobo ereader and just love it. I have had it for awhile. It comes with 100 free classic books already downloaded on it. I have never had any troubles with it at all. It also supports library lending of ebooks. There are many free ebooks on the Kobo site plus the Chapters site and other sites out there that have free ebooks. It can hold up to 1000 books and also has a slot to put one of those little memory cards which you can add more books too.
I also use a program www.calibre-ebook.com that will transfer files from one type of file to another so if there is a ebook that I would like to read that the Kobo doesn't support the file type you can use calibre to transfer the file into a file that Kobo supports. This site is also free.