i tried the ie800 few days ago in a sennheiser (marketing mumbo-jumbo) event here in our country
the seal is great that i got surprised when i plug it into my ears. i was expecting the right wont get a seal on first time i use the ie800, but its not! the midrange sounds great, very clean, even with that slight hump in the upper mids is still acceptable for me. treble is definitely non-fatiguing but still retains that clarity even with that nasty bass. cable noise is too much as well, no matter how i wear it.
id personally place this iem in the 250usd region, or less. i prefer my ex800st over the ie800. zero cable noise, more balanced sounding, unfatiguing treble, clean midrange, and it has great seal as well.