Still really unstable on my Mac (freezes), I can't believe money is charged for this application at the current step of development.

But, the app has surely come a long way since the first version, tabs and drag'n'drop being well-implemented now. Although, before even considering a purchase I would still need:

1) Stability. A lot more.
2) Cut-n-paste of files (preferably using CMD+X and CMD+V)