I came back to the program recently for some basic mockup work and found it makes a pretty solid basic Visio alternative. You can build some solid flowchart elements, which is great for mockup tools since you're often moving from one visual state to another in sequence.
... really stopped me from genuinely digging into the program was a simple copy and paste method
The copy paste issue mentioned above is still annoying, but you can do standard copy, paste, and move. The main frustration is that it saves to the exact same space so you can't see the overlap. I guess for a free and open program with a lot of amazing features, I can work around an interface oddity.