I can't really provide any feedback on browsing with any of the devices...I've only had a Kindle 3, and I don't bother to browse with it. I agree with one of the comments that a tablet type device would be better for lots of browsing...however for long reading sessions, I prefer the e-ink screens on the e-readers.
Like others, I LOVE, LOVE, LOVE Calibre. I use FLAG (flagfic.com) to download stories in epub/mobi format from some sites, or direct download from others (AO3) and covert them as necessary in Calibre and load them on my Kindle.
FWIW, I absolutely DETEST PDF format for ebooks, even when reading on my PC. It can really look awful sometimes. So I stick to mobi/epub formats.
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Like others, I LOVE, LOVE, LOVE Calibre. I use FLAG (flagfic.com) to download stories in epub/mobi format from some sites, or direct download from others (AO3) and covert them as necessary in Calibre and load them on my Kindle.
FWIW, I absolutely DETEST PDF format for ebooks, even when reading on my PC. It can really look awful sometimes. So I stick to mobi/epub formats.