I'm roughly 68% done with what will be my first completed project on Construct, and progress is going well; better than any other of my projects (ie I might actually finish this one this time).
I've tinkered around with C2 now and then, here and there, and have gotten some surprising results and I like how things are shaping up; however, and I've said this a lot, at this stage, I see no reason to abandon using the feature-rich C0.x for the bare-bones C2. Right now C2 is kind of in its novelty stage, its "Oh look, this is all pretty cool." It won't stay that way forever, as it inevitably gets more and more powerful, but right now Construct1 has a good several years head-start in terms of actual practical usability.