Thanks guys, useful information here

Okay... what is this supposed to be telling me? Is there any reason why I can't equalize any boosts into it should I be required to, to acheive pretty much any signature (seeing as it's flat, mostly)

"Charts are for nerds"   No, they just don't lie and aren't affected by the subjectiveness of the listener. Surely that's kind of like saying "get off the whole science thing, the earth is flat". Empirical data provided by charts is kind of what I'm after as I'm slightly sick of everyone...

Are there ever going to be any responses better than "It's just your taste" as in, an explanation by someone who understands the differences and all the factors that make a good earphone? It's single driver - but as far as I can see it does 20hz to 16khz, flat. How do more drivers help?

I just figured that the number of transducers was kind of irrelevant if the FR response is high, low, and flat inbetween...   Timbre's a good point, but I don't know if that's encompassed in frequency response. As for the totally flat thing, they're apparently tuned to be perceptually flat...

That's not very helpful. I'm asking for a technical explanation as to why other earphones are considered better, because surely you could just EQ one with a totally flat response to your taste? What other technical factors make other IEMs superior? I'm sure there are some, I just don't know them.

This subject's probably been covered Ad nauseam but I've yet to find a definitive answer. I currently have a pair of Westone 4 IEms and they are very nice. But I looked into the Etymotic ER4 and found that it has a near ideal EQ curve, being mostly perceptually flat. But people complain of...