So I looked more into the M3's and it seems that the housing is a bit unique.   Do they have any issues with comfort and long time use?

Do you have any experience with the Eternas? And if I do go with the Brainwavz then how much better would the upgrade from the m2 to the m3?

Hi. I have been lurking these servers for a while, trying to find good budget IEMs (Under $100).   I have narrowed my search down to the two IEMs: ViSang R03 and the Fischer Audio Eternas.   I want to know which one would be better for my ears.  I listen to a lot of acoustic and pop...