I can vouch that Rotorz is AWESOME. If you're making a 2D or 3D tile-based game, or even a 2D game with layers of backgrounds, it's hard to beat this tool.
Check out the screenshot of what I've been able to make with it. The screenshot is a little low quality. In the game, the art looks flawless. I have two layers here: (a) background - seamless, you would never think it was tiled, (b) foreground - bricks, (c) animated water - will require a little extra coding, (d) objects with different shaped box colliders.
I'm currently using the Rotorz Playmaker actions to build and destroy terrain during gameplay, determine where my creatures can & can't go without having to rely on the physic engine, and a few other things.
Oh yeah... only THREE draw calls!!!