Conclusion: The versatile-but-not-flawless Sennheiser MM 450-X is a Bluetooth headphone set that also has active noise cancellation and the ability to be used as a wired pair.
Pros: Excellent audio performance with crisp, articulate highs. Supports Bluetooth and active noise cancellation. Lightweight design. Can be used as a wired pair.
Cons: Noise cancellation emits audible hiss, causes some distortion on deep bass tracks at high volumes when engaged. Quite expensive. Slightly uncomfortable over long liste...