I've fallen in love with Reveal.app - as an iOS developer, it's probably the most useful tool in my workflow. It and AppCode (an alternative IDE by JetBrains, far superior to Xcode) make me an order of magnitude more productive than I could otherwise be.
Glad to hear you love it. I have been using it relentlessly for iOS 6 -> iOS 7 compatibility issues.
Is the license perpetual or will I stop receiving updates after 1 year (or after Reveal 2.0)?
Perpetual for current major version. Will not expire after a year.