I have one that I bought for curiosity, but I never use it now. I kept worrying that if I lost my grip, I would drop the frame. Somehow holding the frame directly feels more secure.
If you have a J-hook hive tool, just lever that under the end lugs of the frame, and lift it enough to get your fingers around the lug. Then lever the other end up while lifting the frame up straight. Once out of the box, you can gently let go of the tool end, put the tool down and grab the second lug. This won’t work for really fresh foundationless frames though, as the wax is very soft and may fall out if you let it tilt that much. A better refinement of this is to use a mini-hive tool, like @JeffH used to do - do you still use it, Jeff? If you hook out the frame with that, you can then “palm” the tool and grab the frame at the same time. Very easy.