That's the thing. It's not an easy IEM to get your head around. Unlike CK10/DBA-02 which are still within the traditional means of presentation, DDM / SM3 do it their way. If you get used to their ways, over a period of time, it's hard to dislike them. Imagine a live stage with vocalist at center, guitarist to the left, drummer to the right. That's how most IEMs will present the stage. With SM3, the vocalist will be up front, (
Edited after actual listening) and the things are much more spread out. Most IEMs would present the real stage within the confines of your head, but SM3 takes a few things 'out of the ear', 'behind your head'. If someone is very particular about the feeling of "being there", SM3 is not for them. It has it's own distorted vision of the stage.
Like appreciating some weirdo award winning movies, it takes some adjusting. If you read dfkt's review, it's a perfect example of how things go with SM3 - dismissal, denial, trial, acceptance, appreciation. Luckily for me, I am already a weirdo looking for a "different" ways to see things - be it movies or IEMs, so I took very less time adjusting. If you do fall in line, 10/10 looks absolutely correct. If not even 8/10 would look charitable.
This is how it approximately feels:

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This is the actual setup :
http://www.flickr.com/photos/hsqsoft/4741690579/
The rectangle is Kurt Cobain. The one on SM3 to the left is where the initial guitar begins. But, it's pretty close or even confined within the rectangle itself in HDSS. The left edge is cymbals, the right edge is guitar. The two lines on the back of HDSS are how I felt the crowd clapping at the end of the song, where as in SM3, they are behind my head on left and right edges. Also, in HDSS, most of the cymbal strikes are closer to the drummer at the center with a few at the edges. In SM3, I felt more at the edges than closer to the drummer.