A bit too soon to fully answer your question I'm afraid. My first impressions FWIW:Thinking of switching to Kobo, how you finding it? I guess you can't compare it to Kindle but still would like to know.
- nice format, not too heavy
- the case was recommended in several reviews, so I added it right away
- uploading epub files seems to be handled via a usb cable (no wireless on the Clara I guess)
- nice screen, with brightness and (auto) natural light settings
- synchronization with Pocket (though I haven't got that working yet)
- I plan on giving Calibre a closer look as well to handle my library.
I've seen quite some reviews, including Kobo-Kindle comparisons. In the end, I went with Kobo.
Kindle is said to tie you into the Amazon ecosystem.
HTH