Everything works great with ThinkPad S1 Yoga. Works great on Win8 and Win10 and also works out of the box on Linux (Ubuntu 15.04). It's actually smoother on Linux, as Windows shows a series of notifications when connecting. Have only tried 2 simultaneous displays so far (built-in and DP - built-in and built-in mini HDMI out also work fine at the same time and at 1080p+4K 30Hz). The only thing I could wish for is that it can pass 4K via DisplayPort (doesn't work at 24 or 30Hz - I tried with an HDMI adapter, could only get 1080p). That's arguably the bandwidth limit of the OneLink interface, and since it says a maximum resolution of 1600p, I can't complain. The cable could have been a bit longer for more flexibility in desk placement and it would have been nice to have both rear and front audio out.
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