I've had two or three pairs of these M6s over the past couple of years. I use the medium flanged tips. I love the over the ear wire and how well they stay in place while moving around (mainly listening to audiobooks while out walking).
However, I've had two main issues with them...
- The cable gets severely tangled quite regularly. This is caused by the ear wire hooks and lack of any cable management system. Can be really annoying.
- The tips slip off after a while. They loosen off the channel that locks them to the earpiece. The tips either stay embedded in my ear canal or fall on the ground and lose them! I have temporarily fixed this (several times) by using a little clear silicone gel in and around the channel to stick them back on the earpiece.
I have also had a problem with breaking the shirt clip. I destroyed two of them (I think my rolling on them when listening to my current audiobook when laying in bed!). I contacted MEElectonics and they replaced them free of charge and included a couple of spares. Fantastic aftersales support! I was amazed by how helpful and friendly they were.
SQ is ok. These are not high-end audiophile in-ear headphones. As with most in-ears, it's the tips and the seal you get with them that's important. I listen mainly to audiobooks and the encoding on some of them is not that brilliant anyway. The SQ of these headphones are more than adequate for an everyday pair that gets used/abused a couple of hours every day.
For the money (& support) I don't think there is any over the ear, in-ear canal headphones that can match them at the moment.