I've been using the new version of Fantastical for a few weeks now, and if you liked the first version you're going to love the new version. Fantastical has always been designed for ease of use and worked like a dream, but Fantastical 2 builds on those strengths and takes advantage of some key iOS 7 capabilities that, for anyone who uses their calendar daily, will appreciate.
Perhaps the biggest example of a key iOS 7 tech: Background refreshing. With Fantastical 2 you won't need to take a trip to Apple's calendar any more. Fanastical will simply update automatically even if you don't launch Fantastical. I'm constantly adding items to my calendar at my computer (using Fantastical