The feel is perfect. Much plastic but that's BOSE (US) like. Bose also like, however, is the high quality of materials incl. The very soft and well seated Hörpolster.
I use the phone quite often for conference calls and can say that also represent two hours sessions no problem.
Sound is also BOSE like. Satellite - something Bass emphasized but balanced and pleasant.
In some reviews the headset will sound compared with other pure BT headphones.
The lagging something I think. The BOSE is no high-end headphones. But still a very good.
Taking the proper sense of the device - namely a BT stereo headset to be, I can say that I know of no better device in combination on the market.
From me an outspoken recommendation.
Who is looking for a pure BT headset with other devices is possibly happier (Harman Kardon for example).