I have one and keep it open when fishing by myself,and have it stowed otherwise. It does save a lot of space. Also easier for travel and storage in general.
Haven't seen any issues with fins. It's a finer mesh for sure, but very soft with smaller holes, and super deep (almost comedically so). I don't get how it would cut fins, to be honest.
It does tangle with hooks a lot more than the larger/thicker mesh though.