Well, it's downread.com, still in beta, but very usable and nearly feature-complete. Not sure what else to say. I strive to make it better than the competition :) HTML/Styles is one aspect. I am not aware of any other RSS reader that supports styles in articles as well. Downread even supports CSS, CMS-specific CSS classes, Tailwind, and custom styling for difficult, popular feeds.

Regarding the habit... I don't know, doing it forever. Whenever I have a moment to read, I open it. Before Downread, it was Feedly, and before Feedly, Google Reader, and before Google Reader, I don't know, some desktop app. It's pretty much the only way I read, and I read a lot.