In-ears are portable and pocketable, but can be sonically limited - over-ear designs give you full immersion and noise-isolation but are bulky along with it. On-ear headphones conceivably offer the best of both worlds.
Admittedly the idiosyncratic style and open-back (for which read: leaky) design won't be for everyone, but you simply can't argue with the sound quality here. It's balanced, detailed and dynamic - and now it's yours for less than £250.
The best Lightning headphones we've heard. The M2Ls deliver a punchy, detailed sound thanks largely to the excellent integrated 24-bit DAC and amp. There's also a built-in mic for taking calls and using Siri, as well as controls on the earpad.