I don't really use them with videos but I found a review that claimed to measure a 140ms delay when watching content (which was ranked 2nd best in their list)

Tbh I would've by now, I just hate wearing soft-tip earbuds in general. But if Koss adds anything else to the Utility Series it'll be auto-deducted from my bank account.

For IEMs I would go for a hard plastic earbud like the Monks (which I have) but that form factor seems relatively rare in higher end gear.

These are my modded Koss UR40's on the classic PE headband with GVOEARS pads and a KZ ZST cable.

The stock UR40 has KSC75s clipped inside them, but they have a shallow black housing, IMO even better looking than the Massdrop X version. This makes a negligible difference to the sound (none that I can discern) and they can still be clipped onto the Parts Express headband. The GVOEARS pads are like Yaxis, but a little thinner. Cable is soldered directly to the driver.

I usually plug them into an Anker SoundSync, which costs more than the headphones themselves, but they have the best Bluetooth, battery life, and DAC of any wireless dongle I've tried.

Low cost was not really a priority here, I was just playing around with Koss headphones I already had, mixing and matching drivers/headbands/pads until I had the best looking and sounding creation. I'm making another version of this with leftover Porta Pro drivers just for fun.

The only other good headphone I own is the HD560s running through an Apple dongle, which I rarely use unless sitting at my desk for work. I can't imagine I'll be buying much else in the near future.