Saw this linked to on Daring Fireball the other day.
As of the past two weeks, I've been using Arc pretty heavily. While at first, I was a little confused about setting up the iOS app – turns out, you *have* to setup on the Mac first, and opening new tabs & closing them on iOS is confounding on initial use – I've grown to absolutely love it.
Turning the side-bar into not just websites but notes, drawings, and collections took some getting used to. After a while it grew on me, and now it's my main browser of choice.
Seeing that a Windows port is coming is fantastic – as my computer at the office is a Windows machine – and I hope that *eventually* boils over to an Android port as well. (While I doubt it will, if their end goal is large user-marketshare, as a Windows port and SDK allude to, it would be an eventual inevitability.)
Two thumbs up overall.