If, like me you were a happy Sunrise user, and were in a bind looking for the next best alternative to it after it was shut down, then Week Calendar will prove to be even better.
I rely on Week Cal so incredibly heavily.
I love the dark GUI option, the ability to invent new entries based on ones used in the past and customize with meta level insanity to make minute variations between slightly differing repeating events, add emoticons for those of us that rely on visual recognition, multiple alarms, integration, multiple views etc etc its just the best Calendar app Ive ever seen and I have been through all of the other options on the app store.
I wish they would bring the dark GUI option to the iPad version.