There’s an extensive review of the app on SA, but I’ll post this here for posterity (I’m never sure what to do about posting something here after an SA review).
Alarms is a brand new way of creating time based notifications on your Mac. Drag something to your menubar, and your entire desktop slides down, revealing a slick sheet painted in Helvetica Neue. Drop tasks on the dynamic timeline, and the buzzer will go off when your task hits the time. Drag links, text, files, or create new tasks by double clicking.
An app you must try out if you haven’t already. If you do like it, that’s $12 for a license.