What heavy duty earphones are there?

I've had the MEElectronics M9 for a few months. Very happy with the sound quality and they seem very durable so far - metal shells, thick cable, beefy plug. Plus the company has a reputation for good customer service should anything happen. From what I've read on head-fi.org, the M6 model is more suitable for sleeping than my M9 because it stays in place better and is also flush with the ear. Supposedly they sound similar to the M9 which sounds excellent to me - I own some skullcandy and JVC in-ear models and I've heard Beats Tour and some other higher-end ones (Klipsch, Denon) and the M9 is definitely closer to the pricier ones than the similarly-priced Skullcandy and JVCs.