Summary: I use them continuously: during the commuting in the subway, on the plane, at home and in the office for my conference calls.
I was expecting much lower musical quality from a BT can, but actually I had to change my mind: those headphones are remarkably good.
Pros: Work as a headphones even without batteries, very comfortable, light weight, very good built , good sound
Summary: One day in the Stuff offices, our Reviews Ed mused to nobody in particular that if the Sennheiser PXC 310 BT headphones had a mic for taking calls, they could well be the only cans he'd ever need. And it looks like his wish has finally come true with the launch of the Sennheiser MM 450-X.