It does leak, but when I listen to the 650s, it's usually just for personal use at home, typically when I want to hear more dynamic range than my home theatre allows without annoying the apartment neighbors. They're best for casual use, not for studio mastering or the like.
The Momentums are for out-and-about use, and do a pretty good job cancelling out all but the most noisiest of traffic. Their best feature though, is they don't require the same amount of volume gain to properly drive them compared to most cans. They're specifically designed to get max efficiency out of portable devices.
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Everyone has an opinion. Mine just happens to be a little more informed than most.
Electronic Music Critic: Near-Daily Ruminations Of Music I Own, In Alphabetical Order!
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