Attach/detachment are easy. - algunos otros como los BOSE QuietComfort 35 II, que aunque no los he tenido en casa he podido probarlos en tienda. Sandals are very nice but left foot had a defect with the strap and did not fit the same as the right foot, to was a bit annoyed of the nuisance of having to order another pair and the need to ship these defected ones back. I left the screw loose. This is a must have feature, and I dont understand why a lot of OEMs force you to use their software 24/7 to keep your lighting effects. The sole is thick but still flexible. November 13, 2020: Ive come to the conclusion I received a defective cartridge. By the third day the cheilitis was GONE. These dont work. Excelent!