Comfort level: it is a supra so it's on it's less pleasant than cirum, but it is a great comfort. I can carry the 2 hours before feeling a gene and replacing. The advantage is that suddenly it yours very well when I'm cycling (to go to work).
Level insulation, it is not bad (as in one direction than the other) but not in helmets like the Bose (normal along the insulation is the Bose workhorse). But there is more than enough for me in the street, cars means when they are close, it's better on the train and it is well insulated but if there is an announcement will be heard in the background and allows removing the headphones moment. The others do not hear much less to very strong. For me it is a level of insulation that are well.
In short this is a great headset for both its sound, its comfort as for its exploitation not require a big source, plus the quality of finish and style that's great! I only regret that the order on the cable does not work on my lumia cable and that it is too late.