Had a pair of M6 for a few days before I returned them because I couldn't get used to IEMs. They were great otherwise.
Anyway, for $23.10 shipped to my door on amazon, they were great.
Nice and clear and plenty of bass for me when I got a proper fit. I just have weird ears and couldn't get them to fit every time.
I'd easily buy them again at the original price if I wanted an IEM.