I have both the QC35 and the 700's. I will weigh pros and cons for you if you are on the fence about buying these. I will give you the bad news first because I prefer to leave you with a good taste in your mouth so to speak, after reading this review. CONS:The QC35's are much more supple and thicker as far as the leather and soft padding is concerned therefore making the QC's more comfortable than the 700's. I let over 15 people try on both and they all agree. The 700's are still soft and are extremely comfortable with soft leather but the QC's take the cake in this portion of the comparison. The 700's are about half the thickness as the QC's maybe almost 3/4 and that's being generous. Also, the QC's are "BY FAR" more user friendly with its folding stow n go option whereas, with the 700's, you have to take your time sliding each earcup up the side rails of the headband; both left and right individually, then you turn each one 90° and finally you can then place them in your carrying case. They lay flat with the earcups facing down. Again, the QC's get the win here. Especially when you're in a hurry. If I were to have a "biggest gripe," that would definitely be the one. However, I do not have a "biggest gripe," I am still happy with both but it was a very big change for me not being able to quickly fold my headphones and stuff them in my coat pocket or its case or wherever I felt like at the moment....you absolutely cannot do this with the 700's they need to be put in their case… read more whenever you're not wearing them, they DO NOT FOLD! I just want you to know this. Also, when your performing stow n go with the 700's I quite often find myself accidentally pushing the power button because you must grab the sides of each earcup in order to slide them up the rails of the headband to be put away. The power button could not be in a worse spot for me personally but who knows, it may never even be an issue for you. Those were the cons for me personally and in my opinion, that is a very short list.PROS:The app works flawlessly for me I have never had an issue. The 700's sound a bit better, they are a little more crisp and the bass is a little deeper but it isn't a huge difference. If you are an audiophile you will be able to tell the difference but a casual listener will be fine with either. The outer earcups on the 700's have the "touch and swipe" technology and you can also change the levels of the noise canceling that you want so you can let in as much ambient noise as you would like. You can swipe in a cross formation meaning swiping up or down affects the volume and swiping left or right affects the tracks and FF/REW. A lot of these features are adjustable in the app. Overall I think the 700's are a little more technologically advanced than the QC35's. If you are strictly comparing the two for their sound quality alone, I would say the 700's have a slight edge. However, the QC35's are more comfortable, easier to transport and are less expensive. Or you can do what I did and buy both so that when one pair dies you can rotate them and always have charged headphones. Either way, I hope this review helped and good luck with your purchase!

read less