Just got the E40 and it's very impressive for 99usd. I listen mostly to EDM and alternative rock. The E40 handles all of it extremely well. I'm currently using it with spiral dot tips and my source is a fiio X1 hooked up to jds labs c5 amp with the bass boost on.
I find the E40 very accurate across all the freqs. I was looking for an upgrade to my se215, particularly in the mids and highs. On acoustic rock tracks, the E40 does so much better in terms of details and accuracy. Somehow on the se215, the mids and highs are just not as refined. Bass reaches down low and strong quite similar to the se215 but the difference is that it is tighter and more controlled. The last time I heard bass this good was in a se846!
I also had the chance to try the E70. I found it to be sterile and analytical. I wouldn't buy it at its current price though. But it's still a very capable IEM nonetheless.
In conclusion I would say the E40 sounds just like my HD25-1 except with more solid bass. The spiral tips does expand the soundstage a little but the stock tips are not that bad either.
Can't wait for aftermarket cables to be release too, not really a fan of the memory wire.
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