1) how does it handle a large quantity of books - four or five hundred? On the Touch, it can get silly slow moving from reading a book to selecting another, or while it gets it act together after recharging - a couple of minutes, sometimes.
2) is the Windows application for managing purchased books (no Linux application, naturally, even though this is Linux box) the same as for the Touch? If it is, you'll find that it displays only those books downloaded from Kobo and not anything you might have otherwise acquired - and my entire collection at present is epubs not acquired from Kobo... The excellent 'Calibre' handles things properly, which is a relief and a credit to its writer.