After 4-6 days of use, I heard a faint snapping noise and realized that the hinge that swivels the left headphone cup had become loose

The only concern I could see people having is that they're open backed design meaning they'll bleed noise while also allowing noise to infiltrate

Two main cons I have read about these headphones is the lack of noise isolation and sound leakage.

and I don't like particularly loud music or noise

They aren't noise-canceling so in an area with loud ambient-noise (airplane...

These headphones do not isolate the noise of your surroundings.

My only gripe is that they have virtually no noise isolating capability, so people around you can hear your music if you set it too loud

environment- headband may occasionally pull a hair; adjust the band BEFORE placing on head and do not adjust while on head to prevent this- occasionally a small hair may get stuck inside the driver causing a slight rattling noise; gently remove earpad and blow out the hair to fix- earcups pivot slightly for comfort, but mine developed a creeky noise when pivoting in the left earcup; sometimes audible during listeningConclusion

The ear pieces are "open back", so they do not block out outside noises and also leak a little bit of sound

Downside is they don't cover up outside noise very well at all

Awesome bass n treble for the price, only problem is others get to.hear light sound when u hear at 75% of Max vol

cheap，I like it

The only thing I think the Portapro's could improve on are comfort and perhaps a removable/replaceable cable(s