I tried momentum 2 wireless for 15 days and plantronics backbeat pro for 10 months. Backbeat pro has stronger bass that stands out in certain songs and great value for the money with the high tech merchandise, but momentum 2 wireless blows it out otherwise. Momentum 2 wireless has more balanced soundstage, better sounding mids, highs are nice and smooth, warm sound quality, bass is not as strong but nice too, more comfortable than the backbeats. Backbeat pro is the Lexus ES350 to momentum2wireless being the Rolls Royce Phantom. I tried the QC35 in bestbuy for 5 minutes, which is the Lamborghini Aventador with all the sounds and bells
I returned my momentum2wireless as I had to return them in 15 days for full refund because I want to try the new sony mdr1000x. I will buy both in october, keep the one I like more and return the other.