MIT cables - any differences between S1-S3 ???

I am trying to decide on MIT Shotgun speaker cables and I am wondering if anybody had a chance to compare S1, S2 and S3 as well as their bi-wire versions.
I have a quite revealing system and I will likely hear any differences between.

I will appreciate any comments.
New MIT Shotguns S3, S2, and S1 all use the same internal cable -- the biwires all use a similar cable -- but the networks get more sophisticated as you go up the line. The S1 will have significantly deeper, more articulate bass as compared to the S3, and will sound more open. If your speakers are biwireable, you WILL hear an improvement in openness and midrange articulation if you use the biwire cable.
It would help to know which amp and speakers you are using.