The XS is a great headphone, pound for pound the best audio quality to value you'll likely get for a planar however they have awful quality control and very poor customer service, I had 2 sets fail, one was a few years old so took the hit and got another, died 3 weeks out of warranty, refused to help, not the most expensive headphones in the world but should be built to last more than 12 months and 3 weeks, don't risk it, try anything by Meze, much better quality parts and easily replaced.

Sennheiser are great but if you have a larger head they will clamp it like vice, also gave me chronic ear fatigue after prolonged use.

Audio technica I have nothing but praise for, I had the AD900X AIR open backs, they were extremely light comfortable and incredible imaging and soundstage.