On the number of drivers (and Apple Fanboyism)
I'll be the first to admit it. I'm an Apple Fanboy, living blissfully within Jobs's reality distortion field. If I had the money, I'd buy Apple stock. I not-so-secretly desire an Apple t-shirt. I love Apple products so much I want to take them behind a middle school and...never mind. As such, I've defended iBuds in the past. Yes, ma'am. And I certainly didn't grab these expecting them to suck. I had high hopes for thise things of beauty. But doing the comparison against my ER-6i, they just didn't cut it in everything except bass and maybe speed. Less detailed, less clear, way smaller soundstage. I'd like to be able to do a comparison with the ER4, to replicate Spad's experience, but that's not going to happen. Anyone want to send me an ER4?
Sure, I can concede that ceteris paribus, dual armature driver headphones are (or should be) better than singles. So, if driver count was all that mattered, the Apple IEMs should beat the ER-6i. But driver count ain't the entire story, it seems. Erm, here's an analogy, for those who dislike abstract talk: Ceteris paribus, the more push ups you do, the larger your muscles will become. (Caveat, I don't know if this is true. Just concede it for sake of argment.) So, of Joe does 50 and Bob does 20, Joe should be more muscly than Bob. But what if Joe does lousy push-ups and eats lots of crap, and Bob does chin-ups and weight-training and cardio on top of the pushups? It's likely that Bob would be more muscly than Joe, isn't it? From this analogy, Joe is the Apple IEM, Bob is the ER-6i.
An additional note on price: On one hand, it seems fair to compare the Apple IEMs with other IEMs of similar MRSP. However, other IEMs tend to sell on the streets for more less than their MRSP. So, I think we have to keep at the back of our minds that, for example, the ER-6i usually go for $75 and sometimes go for $50.
Edit: Additional impressions added to OP (Summary: Vocals are more forward than via ER-6i).