I'm actually using the Triple Fi-10's medium single flange at it works for me perfectly. The monster kit I mentioned was transferred to me by another member from here, they are offer a wide range of selections and they work well but the TF gels work better for my taste. I did try the bundled bi-flanges, but the small ones doesn't seal at all and the large ones create muddy sound. Once you strike the right balance, than you get good sound out of these plugs, but personally I don't find them enjoyable neither with too much leak, nor with very effective seal.
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I have those monster Supertips and at least for me, they just don't work as well as the stock tips. If you wear the IE8 over the ear, the stock double flanges gives excellent seal. Just make sure you push it deep enough. Sony hybrids work well and are a better option than the Supertips. YMMV.