I have the M4U1 model after owning Sennheiser Momentum for six months - they are obviously better in side-by-side tests and they have larger ear cups that I can wear all day with comfort in a noisy office. Definitely my closed-headphone favourite. Too bad they aren't pretty stitched leather like the Sennehisers!

I don't believe ANC is worth the $100 - as you say, same headphones minus ANC.