The P5 suffer from a disgusting design flaw: Under the magnetically connected ear pads, the headphones have a soft fiber-like material that's glued in. The glue will melt and leak between the contact points in a few months, which will stain white t-shirts etc.:

https://imgur.com/a/W2i0pPa

The importer first claimed they fixed this issue mid-production, they did not. I went through FOUR pairs. Every. Single. Time. the glue melted.

I wrote to B&W about them having a systematic problem in their manufacturing process, they advised me to contact the importer for a replacement pair.

Then came the P5 series 2 which the importer said would fix it. Finally... Except, it did not.

When I contacted the importer about the problem being still present, they flat out refused to replace the headphones, but instead offered a discount for PX headphones. I told them I would've annulled the purchase like the Finnish law allows me, had I been made aware it would never be fixed. I also told me I wouldn't pour another cent in B&W products.

Also I found an entire site dedicated to the design flaw in the PX, which I alas, can't find now.

To conclude: Do NOT buy B&W headphones / consumer loudspeakers. The company does still manufacture high-quality high-end loudspeakers, I've been satisfied with the CM1s and no complaints after 10 years of use.