Firstly what a great design! The Phonak's don't look like anything else and I find them very comfortable. The cable is also very nice, no memory effect and supple.
Sound: First impressions were it sounded a bit thin. 2 things have helped that for me, a deeper insertion and also amplification! No doubt said a million times here but my mobile just doesn't cut it with these, they need power! Playing with the filters is interesting, essentially they just seem to attenuate whilst adjusting the sound towards a bass emphasis as you go from no filter > grey > green. I don't like the green.....at all. Dark and dull. Grey is nice, more my thing I think. No filter is probably a bit spikey up top for me. Also sound stage seems to degrade moving from no filter > green.
Out of interest are all the Phonaks hard to drive and are the filters interchangable? I know this info is no doubt burried in this thread somewhere but I'm inherently lazy