I've had several hours on the Parterre's now, and I have to say the sound signature is just what I've been looking for. Smooth, natural, airy, coherent from top to bottom. Soundstage might not be the widest (as has been discussed), but certainly good enough that I could almost give up using open back headphones. I'm surely not experienced with as many phones as many of you are, but these are simply the best I've ever owned. Wonderful sounding iem's with everything I've thrown at them so far. The only small niggle I have so far is the cable, which I will replace with something a little more flexible.
I'd also like to thank Dimitri and MusicaAcoustics for making my purchase such an easy process. He's been great to work with. I'm a happy camper!