I have 2 of those, wife has 1 other. They all sound good but I wouldn’t call them neutral after having the hd58x, beforehand I probably call my wife’s hd681 Evo neutral.
The Portopros always fell off easily on me, and even with my short hair (guy who prefers a buzz cut and let’s it grow a month or two) it will pull out hair.
The Ksc75 are light but they kind of have a loose feel during exercise and as long as your dancing isn’t too intense it will probably hold. They sound good, and using a cheap headband mod will make them sound better but than it will probably fall off easier. These sound the least neutral out of what the previous poster recommended.
Superglue 681 Evo, and 668b (both are semi open, closer to closed back in my opinion for isolation), I own the 668b and my wife own the 681Evo. They both sound good, better than the Koss in my opinion, and good enough my non audiophile wife had a huge smile on her face once she heard it. I gambled and chose sound quality over the cute cat ears one she really wanted, not a single complaint and she loves these and uses these around the house with her phone and computer all the time. I used my hd668b off and on for years, the two headphones that dethroned it till temporarily were the portopros and ksc75 till I got my hd58x. I would argue these are all good entry audiophile grade headphones.
Now for these two headphones the clamping force is good enough for some non intensive dancing, but it’s semi open and it isolates sound better than most people think. At normal listening level I can’t hear what my wife is watching if were in bed next to each other, I have to basically rest my head next to or on the headphone to faintly hear it. We can’t carry on a conversation with these on it isolates and distorts sound, we can tell someone said something from across the room, but not what was said. If the door is shut they can yell from the next room dinner is done and I can’t hear them no matter how hard try where as with true open backs like my hd58x I can easily hear this. The isolation is good enough I’ve told her to please never take these running for safety reasons, as it will block out the sound of cars, people, and animals.
