From the DPReview thread, I can see you've already bought Pixelmator for iOS, so if you'd like to try out its Mac counterpart, the original Pixelmator, you can find a trial version of it here.
Pixelmator Pro is a new app so it doesn't work seamlessly with Pixelmator for iOS, but we also have a trial version of it, available here. P.S. We're also working on a Pixelmator Pro for iPad.
Discuss Pixelmator for iOS and mobile image editing.