My two bits are, after running the 8 betas and using a surface tablet is if you have a tablet with it or even a desktop with touch, it isn't too bad. If you don't have touch, it is a horrible interface paradigm and you need to tweak it to make even the basics usable (not extensive tweaking or anything, but I would go nuts to use it on a non-touch surface as designed).
What kills me is touch surfaces on laptops are insanely expensive, and start around $500 for 780p, and you are still at 780p in the $1000 range. At about $1100, you can find one with touch, 1080p... and Intel dedicated graphics. Somewhere around $1300 start the touch with dedicated graphics. Meanwhile, dedicated 1080p laptops with dedicated graphics start at around $500. Even some tablets have higher resolution and dedicated graphics better than the Intel GMA 4000 (but yes, Intel, you're finally not completely crap). Conclusion? The touch interface has too little bang for the buck at this time, and progress in LCD panels for computers is WAY behind phones (worse resolution, much higher price).
My niece really wants a touch screen laptop with DVD drive. She doesn't care about graphics resolution or hardware. Cheapest I found? $750 with an i5 and 780p graphics. The identical laptop configuration sans touch? $350. Is touch worth $400? Even throwing in intangibles (I don't know the RAM CAS, for instance), does touch add $300 in value? $200? I don't think I could justify more than $100 (and I've seen USB aftermarket for that for TV screens).