Nice, but...

…two things bug me.
1. The app opens taking over your entire window. You can re-size it, but then, closing and re-opening the app, it goes back to it’s default. Working with folders or items on the desktop means this manual fiddle every time. No obvious means to set Preferences - or operate in a way that is standard for other app windows.
2. Attached to this, the tools icons on the left side of the screen - you can hide them and just use the toolbar controls, but again, they return the moment you close / re-open the app. The placement of the tools icons is an issue if, like me, you have your Dock on the left side - to take advantage of the 16:9 format on the MacBook Air. And again, no way of setting these tools to remain off or move to another location in the window.

As for the app itself - in its Starter form its okay, but doesn’t offer much in basic photo manipulation over and above Preview or iPhoto, so do you really need it? Some bells and whistles and the Essentials kit adds more, but would I ever use them?
Also, some of the sliders in the basic controls particularly are less than subtle.

Marylebone1 about Autodesk Pixlr, v1.0.1