I develop Construct, and just to repeat what Doppel said a little, the most telling thing is it hasn't yet reached version 1.0 - we're still in beta. I have to admit there is still one known case (although hopefully rare) where your .cap file can become corrupted and you can't open the file any more - although autobackup should help stop this from ruining everything. The aim is to have construct 100% stable and completely viable for at least semiprofessional game development when we reach version 1.0 - you could look at our release date history and make your own guess as to when that might be.
So while I would not advocate serious or professional usage of Construct until 1.0, I would welcome any dabbling and reporting of issues, bugs and those annoyances that send you fuming, so we can fix them for the 1.0 release. That's how 1.0 is going to end up stable and useful - with the input of our testers!