I use them for running and Gym.
Really like them.
they isolate me from the rest and sounds good
Got the qc35ii about 2 weeks ago.
About six weeks previous to that I bought the senn. Momentum3 wireless.
I've always wanted a pair of qc35ii and I saw a fantastic price for a manufacturer refurbished pair, so I bought them.
If I didn't know otherwise I would have thought they were brand new. The original box, the packaging, the accessories and the headphones looked untouched as if they were new.
Everything worked like a charm.
So I'm going to compare the two, just the anc and the sound.
First the anc.
I don't use the apps for either headphone, since everything I need can be accessed by way of the buttons on the headphones and the only time I use the anc is when I'm mowing the lawn.
The momentums are decent but the qc35ii are definitely better.
Second the sound.
The qc 35ii are more balanced, the momentum 3 lean more to the bass. Not that the qc35ii are shy in the bass.
The only thing that throws the balance off a bit is a spike around 6khz which pushes the low treble up a bit. The rest of the treble is neither laid back nor boosted.
The momentum 3 aren't as balanced, as they put the bass ahead of the midrange and treble except for a treble spike at about 8khz to 10khz.
I enjoy both headphones, the senns. are what I use for listening wirelessly to movies because of the extra oom- pa- pa in the bass which is great for explosions, rumbles and other low frequency sounds in movies.
I still use them for music too, but sometimes the bass gets to me and I find it a little annoying.
This thread isn't followed much anymore, but since I just got the qc35ii, I thought I'd post here.