The MTW 2 has very good passive sealing if they are fitted correctly.  The ANC is just for low frequency filtering. Together, they work very well. Size of eartips,  the way you lock the buds into your ear cavity and your ear shape will give you different result. I am very pleased with the ANC.

I have been using the Sennheiser MTW2 since the beginning.

Music: is ok, bit better than the Jabra Elite that we also have.

Call: is unuseable, even for a TW. I use the cheap wired headset of my phone.

Connection to the Phone's Bluetooth is slow, 1-2 sec. For music I can live with it, but for calls is annoying.

Cannot switch easily between sources, it needs forced disconnect from the last device to switch to another device. For example, needs turning off the Bluetooth on my phone, to switch to the laptop. Often it needs re-pairing for the switch.

ANC is kind of modest. Mostly I cannot hear a big difference between on and off. Very far away from an over the ear Bose noise cancelling. Plus, it doesn't tell if ANC is on or off.

All in all, I find the music quality is good, everything else is rather poor: short battery, no wireless, slow Bluetooth connection, poor call quality, big and heavy storage case, no audio feedback if the ANC is on or off, modest ANC.