A:Answer I have found these to be excellent for listening to music, and immersive/theatrical experiences. Especially, these create a great soundstage. They are comfortable enough to wear for extended periods of time.
With that being said, the Bose QC 35 are my go-to for situations that I want noise canceling and a longer use. They have better noise canceling than the Sennheiser, although the Sennheiser is certainly passable for any situation. The QC 35s are also lighter and more comfortable. The qc35s don't produce the same level of sound quality or fullness as the Sennheiser, but do produce a very good sound nonetheless. Both headsets are well worth the price that you pay for them.
To put in another way, the Bose are my go-to for everyday use. The sennheiser's are my go-to for premium sound quality when I really want to 'experience' something.