I use it daily too on my Mac and its usability is pretty bad. Copy and paste sorta work, but I can never remember when to use cntl-c versus apple-c in this app. The UI is hideous and very un-Mac like. It also doesn't seem to handle network disconnects very well, oftentimes requiring a Force-Quit if I've switched from wired to wireless networking.

That being said, I still use it because I haven't found anything else free that I like. I suppose if I use a tool every day like this one, I should pay to find one that works better.