They are a bit more expensive, but worth it for comfort

Compared to the Pro:Significantly more bass volumeA bit more bass impact (even adjusted for volume)Significantly smaller soundstage (one of the smallest soundstage in ear buds)A bit worse in imagingGuitar, cymbal, male vocal texture less defined

Coming from a pair of Jaybird Freedom 2's that cost around $140, I was a bit nervous biting on these $40 headphones for the gym

They are a bit more expensive, but worth it for comfort

But as soon as I let go they slip out just a bit, and the sound degrades considerably.

In summary, I think they sound incredible, have the perfect amount of bass right out of the box, go a bit louder than I will ever listen to them at, and will be my go-to headphones for EVERYTHING including the gym.

It just tells me that the B&W PX's are not as impressive as I