Well I'm flim flaming again

I'm going to see if I can find a Clara BW in a local shop and have a look at it in the flesh. I did some measuring and it's almost the same size as my defunct Kindle Voyage, which I got on with OK.
Interestingly as I had my Kindle Voyage out I thought I would compare the 'feel' of it to my Paperwhite which is bigger, and I was surprised, the Voyage being smaller felt much better in my hand, I didn't realise quite how cumbersome the Paperwhite felt compared to the Voyage.
The screen being smaller didn't really make any difference either, at the end of the day you can adjust the font size to suit your eyes which negates the size of the screen somewhat.
I will see what I think when I see one in the flesh.
Just an aside, what do people think of the Kobo reading experience if you keep everything stock, no jailbreaking etc are there any distractions is it easy to navigate etc? On my Kindles I never go to the 'Home' screen I always stay in the book I'm reading or in the library.
I also see the Clara's power button is on the back like the voyage, whereas the Paperwhites is on the bottom, I prefer the button on the back, it feels more natural to me to reach when you finish reading. So another potential plus point for the Clara.
Edit: One more question, did I read right somewhere that Calibre will automatically convert a book to a correct format if you send it to a device that doesn't support the format the books in? All of my books are in Kindle format at the moment, I know I can batch convert them to a kobo friendly format but do I need to bother?