I wonder if anyone buys back covers for the Mini. I find it a completely useless "feature". The Kobo Mini could have been slightly thinner if they had done without this.
I like my Mini for the size. I use it without a cover (I cut a bit of black cardboard to the size of the screen for protection). It is a lot smaller than my Nook with its cover. Now I use the Kobo all the time even though the screen is not as good as the Nook's and the software is rather underwhelming. It is just more practical.