So, not sure how I like the memory wire on the SA7. The cable itself is stiffer, springier, and holds it's bends more than the Sleek cable does. The plug and connectors are all slightly shorter in length. It is slightly thicker but not by much.
As for the sound, after testing on both phones, I think the SoundSoul cable does present slightly different. Not much difference but a slight bit more treble presence and a little bit more air around things because of it. A slight bit of difference in sound but more stiff and unwieldy.
Probably not any kind of upgrade more than an option if you really need a spare and want decent sounding earphones as a bonus. Sounds like the BLOX cable is a better bet if, as it sounds like, it can also be had cheaply.
Edit: After a while with the SoundSoul cable, I find something about it a bit more "fun" sounding. I think it might be a bit more up front and still have similar depth and the image front to back is more 3-D. This all may just come from the memory wire positioning the earpieces but it is there. If the cable relaxes some from being tied up for a while that would be nice as well.
2nd Edit: Okay, I've narrowed down what I like with this cable. Bass is better since it is a bit more airy and this helps the mid-bass quality by freeing it up. Guitars are really nice now. Vocals seem sweeter. Treble is more and more up front and throws a little more detail in my face making it easier to hear. The little extra bit of air is welcome though only really front to back and left to right(they might be a little narrower top to bottom. I may change my view that it is a bit more of a change in sound than I first thought as it has grown on me. Again, more different than better or worse in SQ.
Edited by jant71 - 12/21/13 at 5:11pm