Fortunately, most stuff that I read is math-heavy thus unfeasible as an epub. Yet, there is the rare essay, interview or otherwise math-less text that comes in the annoying epub format that needs to be converted.
Different strokes for different folks, I guess. I do a lot of reading on a kindle and convert whatever I need using Calibre, but PDFs, because of their fixed formatting, are a bit of a nightmare.
I'm not complaining about anything; I'm actually happy that math texts are not usually distributed in epub so that I don't get to use those silly auto-reflowing viewers!
