I was leaning towards the Pro. but when I was at the store yesterday buying my 4K tv, I said **** it! might as well pick up an X1 S, too! I've been wanting to jump back onto the MS ecosystem for some time and the S just looked like an attractive option.

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With the S, I get a 4K UHD player to use in the future with my 4K tv - that saves me a future purchase of $300-$400 more.
it also saved me on buying extra HDMI 2.0 cables, since the S comes with one and is multiple devices wrapped into one.
Having multiple devices in one also saves me an HDMI port on my tv for future things like the NX.
Plus, the S saved me from having to buy another laptop for basic browsing purposes, since the S has Edge. Used Edge last night and it's so much better and easier to read than the PS4 browser ( hope that's still the case when I use it on my 4K tv......lol ).
so, the S solved multiple needs for me and when I looked at it that way, it just offered tremendous value and convenience.
Yeah, I know the Pro will be more powerful. But it doesn't offer the multi purpose functionality I'm looking for. And I'm playing the long game there, too. The Scorpio will be more powerful than the Pro and so in several years time, once the Scorpio has dropped in price and/or got it's first revision, I'll make the upgrade to the Scorpio.
So, yeah, that means I'll now probably skip the Pro. I really felt Sony dropped the ball by not including a 4K player in the Pro - that certainly was a big factor in me deciding to go with the S instead yesterday. I'm not a hardcore gamer anymore, and I'm someone who does use his console as a multi purpose, multi media device.