It has potential to be a great capture + comment/annotate/collaborate tool, but to me there are still some bugs and annoyances that I want other people to be aware of.

Bugs
1. If I go to "edit capture" to add a fancy background to it to share in social media (a feature that I love that is integrated in the app), then this image becomes the capture itself. I would love to have those two things separate: the capture itself where I can annotate and leave comments, and the capture with the fancy background to share in social media or blog post. Of course, it would be nice to have a button to make this edited image as the main capture, but it should be optional.
2. The annotate feature bugs a lot. A few times I have added a rectangle to my capture, and then when I come back to the capture the rectangle is not there. And then when I try to annotate the capture again, the app shows "no data" (I am working with Arc browser for Windows, I don't know if this is a browser specific issue).

Annoyances
1. The crazy big and ugly animation when things are loading appears everywhere. Actually, in my opinion, this specific thing make the whole app to feel much less refined.
2. The app is quite slow
3. The icon of the app disappears in my browser window. Three white arrows and one black one, really bad choice of colors.
4. Please remove the "Upgrade to pro" button on the header of the app.

I am still undecided if I should keep this tool or not.