Tried out the IE800 outside today. The comments on it masking outside noise with the low rumbling bass are all spot on. It´s a bit scary how you can´t even hear a car pass by. Maybe the guys speculating about the tuning being made partly in order to make these sound better outside are right. It also feels great to have cold air move enter the ears. The earplug feeling with armature IEMs just isn´t there in the same way.
One other thing: the attention-demanding sound signature, especially the mids kind of masks the microphonics. Sure microphonic noises are there, but you can´t really concentrate on it much due to your mind moving to follow the lyrics/mids almost automatically. It isn´t perfect, but better than I expected.
PS: +1 for the rock genre comments. Walls of sound have nice depth, the drivers have no problems rendering all the layers correctly. Drums have nice kick to them, especially the lower bass ones. My Ultimate Ears 700 (got them for 50 euros at Amazon, nice deal) sound extremely boring now. All in all the sound signature is coherent and well separated (although not all that airy) without the common multi-armature driver sound where different instruments sound as if from different speakers (which they often are). The midrange is never blurred and appears out of nowhere, even in the middle of a wall of sound. Genres that thrive on dynamics such as rock/electronica sound very nice in low volume too, which is very rare in my experience. Actually the midrange might sound even better then, as the deep bass rumbling isn´t as prominent. The background is blacker then so the vocals seem like they appear even more out of complete darkness in a way that actually sounds similar to electrostatic earspeakers.
PPS: my IE800 also makes an audible mini spring-like click if I press on the shells. It doesn´t happen when I just move my head around. Not sure if it happens when music is playing, can´t seem to hear it at least. I can only hear it when music isn´t playing. Seems to happen more easily on the right driver, but also happens on the left one if I press the right way. Doesn´t bother me at all though and I actually have a feeling it´s a harmless/by design side effect of the driver stabilization/venting system or something similar.