I picked up Contruct 2 about a week ago and I have to say it's really great for quick prototyping of 2d games. I used it this weekend for my Ludum Dare entry, Game-Age : http://www.ludumdare.com/compo/ludum-dare-24/?action=preview&uid=11378
In my entry I recreated 4 classic arcade games: Pong, Breakout, Space Invaders and Galaxian. I evolved each one into the next and finally using elements from each of the 4 games created a 5th unique game.
As per the competition rules I have included a link to my source on my entry page so if anyone wants to see how I recreated each game they can feel free to download it and check it out.