I was messing around with a bit yesterday, but it’s got a long way to go before it can come close to Sketch or Figma. I was also thinking at first that their Figma and Sketch integration would bring outside artboards into the design tab, which would be awesome, but it doesn’t do that. I was bummed.
That being said, their auto-constraints feature is awesome. I don’t know how they’re getting that to work. It’d be interesting to see how reliable it is over the course of something larger. For now, I think that tool will be limited to small component or individual interactions.