Just finishing building my S Works Tarmac and from the little I have ridden it I’m blown away, but don’t get me wrong I don’t think in my hands ( or legs as it where) that it would be massively better/faster than the pro.
I dare say a better or more experienced rider may notice the nuance of the carbon lay up etc.
The one thing I can say is for a hydraulic brake, ultegra di2 equipped bike it weighs in under 7kg and when you put the power down it just seems to leap forward.
What ever you buy you will love it.