Comfort:
These are hands-down the most comfortable earbuds I've ever worn. All other earbuds I've tried became uncomfortable after an hour or so - I can wear the MTW3s for hours and forget they're even there. They sit tight and do not slip at all. Transparency mode is good enough so sometimes I don't even bother taking them out during the day. Battery life supports this, too - with a mix of listening to music, taking calls and using transparency mode they usually last about seven hours without a recharge from the case.
Sound Quality:
Coming from Sony's WH1000MX3 over-ear headphones I found the sound to be a bit flat at first - Sony headphones tend to give you a warm, very bass-heavy sound. The MTW3s are definitely more neutral sounding. But once my ears adapted I really enjoyed the clarity these buds give you. Instruments are clearly distinguishable, nothing is mushy, no audible noise and audible compression artefacts are extremely rare. In the end a lot of it comes down to taste and personal preference but technically this is top notch.
The buds support aptx Adaptive however my phone does not. Instead of falling back to aptx HD (which my phone does support) they fall back to regular aptx which has a lower bandwidth. It's still good enough for Spotify on highest quality but if you listen to HD quality music it might become a bottleneck. I do wish they'd support LDAC instead.
Update: I was able to test them on a phone that supports aptX Adaptive and it's a significant increase in quality. So make sure your phone supports it if you want to get the most out of these earbuds.
Call Quality:
I've had no complaints at all about bad call quality. I really like how you can just use a single earbud for a phone or conference call. Given how comfortable they are it's easy to forget you're even talking on the phone.
Noise Cancellation:
Noise cancellation is well-balanced for normal environments. It doesn't block out background noise completely but gives you a good amount of awareness of your surroundings without being distracting. Outdoors, the anti-wind mode works surprisingly well. In very loud environments they fail to block out all the noise, so on an airplane I would probably opt for over-ear noise cancelling headphones, or even performance-grade in-ear monitors with a tight physical seal.
Misc:
Connectivity and range is about what you'd expect - nothing exceptional but no issues at all. The control scheme works really well and is fully configurable in the app. They do not support multipoint connection (hopefully they will with a future upgrade), however you can still control them with the app while they are paired to a different device.
Update: Multipoint is now supported with the latest firmware and works well.
So why did I pick these over the Sony WF1000XM4 which have a better bluetooth codec and a sound profile that I know and like?
a) Comfort - I'm completely sold on how comfortable these buds are.
b) Control scheme - Sony's buds let you configure which two things you want to control. If, for example, you want media controls and the ability to toggle noise cancelling, you won't be able to control the volume. If you want volume and media controls, you can't turn on transparency mode. I know that sooner or later this would have bugged the hell out of me. These buds give you everything all at once, and it's completely customizable, too.
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