For over a year now I use the headphones E2, in semi-regular use (on average 6-7 hours per week) on stage and in rehearsal.
For the use I make (no need for stereo, not heavy usage time), I am totally satisfied.

His side, that's fine. No breath, and excellent soundproofing. So, I'm protecting the eardrums of his strong acoustic instruments, the returns of foot bath, and even its facade. And I can adjust the sound volume at a low.
Convenience, not bad. First, they are placed very well in the ear, and hold up very well, thanks to the tips of different sizes. The silicone tips are much more comfortable to wear than the foam sleeves, and it does not heat the ear. Moreover, it is more hygienic, and E2 can be cleaned easily.

In short, after a short adjustment period to get used to the ears monitors, now I can not live without !!!!!!
For the model as "low end" of the series, well it's really an excellent price / quality ratio.