Honestly I disagree. I own the Surface RT and a laptop. I use my Surface for 90% of the things I normally did on my icore 7 15.6 inch laptop. Its much more portable, comfortable to use in tablet form and when used with the touch cover on a flat surface I still manage to get my work done.
Now if I had the Surface Pro I wouldn't need the laptop at all since it remains docked to my 26inch monitor which the surface can easily do.
Now you say the Pro is a worst tablet than the iPad, in some ways yes (apps, longer battery life) but the iPad lacks usb, digital inking- a huge benefit on a slate!, flash support , and many other things that you compromised your workflow with. Etc
Now the question is would someone be contented with a surface pro + smartphone instead of a ultrabook +iPad mini + smartphone and I say yes!
Having worked with the Surface Pro for several days now, I can't see how that's an honest assessment. Going from a 15.6" laptop to the 10.6" Surface is a huge detriment to usability. Like I've said, I have solid 20/10 vision and working with the Surface at laptop distances is a huge strain. It works in a pinch, but there is no question a larger screen is more efficient.
Nor can the Surface 'easily' dock to a monitor. It requires re-scaling everything which means delving into desktop menus PLUS logging out. Lets be realistic here.