I have the S5s at home right now. It is a great speaker.
It is much smoother, less in your face than Sasha. More natural timbre - especially on female vocals. The bass from the sealed box is also much better - goes lower, is faster and much more detailed. It can make a Wilson sound boomy in comparison. Now I can really see what people like in sealed box designs.
The only area where Sasha outperforms Magico is the soundstage depth. My guess is that it is becouse of the wider front of the speaker. Sasha's head is almost like a minimonitor, which helps it to disappear better.
A friend of mine has the S1s right now. He loves them too.
Joe - I can see the Q1s in your future