I use it on my Samsung Galaxy S3.
Not often, have to do the finger spread thing & pan around, and forget it if I don't have my reading glasses. Typing out a message is a little awkward for me, not used to not having a real keyboard.
I've tried to view it on a Nexus 7 pad, Android 4.3.
The worst thing is the page navigation. If I'm reading a forum and want to get to the next page, (say page 2 from page 1), I have to zoom the screen large enough so I can press one of the tiny absolute page numbers with my fat fingers. (Actually, they're not so fat, just feels that way when trying to navigate this web site.) Not a "next" or "prev page" button anywhere. Dreadful usability for a mobile device, IMHO. Didn't anyone think to do some actual user testing?