well naminakata87, here is my short review of the M35.
Noise canceling wise it was ok. When i record vocal, it didn't pickup sound from my M35( unlike my sony headphone which isn't a closed back headphone)
so i would say M35 headphone are really great at isolating the sound. Unless.. If you really turn up the volume almost real high though, my audio technica at2020 condenser mic was still able to pick that up (u know how sensitive condenser mic were)
But all in all, it definitely great for recording.. i don't think a singer will need to turn up the volume real high deafening volume for monitoring.
And i would say the M35 is a great headphone for producing a song ( monitoring, mixing, mastering). It have neutral response, which mean u can really hear how a song in your mix really sounds like..
It may not be the best but it can get the job done.
For regular listener who wanted to listen and enjoy a song though, there are other alternative headphone worth checking.
Why is it so? Because this
When listening to the headphone, u certainly couldn't hear if someone else talk to you (or worse, u wont hear if someone break to your house, lol)
That's my review, though it is what i felt. If there something anyone like to argue, u are welcome to do so, u may correct me if im wrong. That way i may learn something. Or if there anything any of you wanted to add is very welcome

Quazacolt, i never heard of IEMs before, thanks for letting me know. Well im actually just a guitarist that just got into audio production stuff, and all this thing is actually quite new for me. It's a long but fun journey for me.. I'll look on to net to find out what IEMs is, do you care to elaborate on IEMs ?

monitoring headphone serve one purpose: monitoring. they may not sound as fun/musical as others, however that is unimportant as they arent supposed to, since they are required to be as neutral as possible
IEMs are in ear monitor, and provide FAR better isolation than a noise cancelling headphone especially custom IEMs which are made to custom fit your ear canal only.
the only reason i can think of a monitoring headphone can be better (not so much noise cancellation ones, since they do induce artificiality due to the noise cancellation properties) is that they are typically much more neutral than IEMs, though, that also depends on which IEMs you're getting. that, and some people are not comfortable at inserting objects straight into their ear canal placing it so close to the ear drums ^^;