I just bought a pair of brainwavz m5 IEMs, and they are amazing. More crisp than the wonderful m1 pair that I lost and much kinder to my ears than the harsh m4 that I still have.
I didn't know about driver flex till recently, I thought the click I was hearing when I put my headphones in was the silicone tips sealing. Now that I know, I am a bit paranoid. The m5 IEMs seem to suffer from driver flex more than my m1s did, and I am looking for some solutions.
The m5 have a vent on the back and a small hole right below the neck of the shaft that the silicone tips connect to. On both sides that hole seems to be filled with glue, is that a problem? Should I return these and ask for one without a filled up hole? Also, is there a good way to tell when you have good isolation? Maybe I am pushing these in too far . . . I am a pretty new IEM user and just don't really know. Head-fi always seems like lots of help, so I thought there was no better place to ask.