I've never owned a Kindle. When I was gifted my Sony Prs 300, which i'm still using, the Kindle hadn't been released in the UK.
When I do finally replace my Sony, I will be unlikely to buy a Kindle. The main reason, is library borrowing. UK libraries only lend epub. As a Calibre user I could get around this. However, I don't think DRM should be bypassed in these circumstances. Alf is my friend where my own books are concerned