Being able to quickly change audio outputs is awesome, I am always bouncing between headset and speakers. Also the pop up volume mixer is better than the built in one. Been using ET for years and years, can pry it from my cold dead hands.
Ctrl+Win+V doesn't do anything for me. The best part about Eartrumpet for me is that you can manage all audio outputs on your system individually. Since I use a virtual mixer, this makes it easy to adjust everything without being to open the mixer, as well as making sure each program is outputting audio to the right place.