While I don’t have one, I know several people that like them quite well. If I needed a seriously portable Windows machine again, I’d strongly consider one.
I've used a slim/light Fujitsu Lifebook for over 6 years, and while it's been ultra-reliable and stable, all things break eventually,l and I've been thinking about a Surface as a replacement.
Now I think I'll wait-and-see if Microsoft pulls the plug. That would be a drag -- the Surface is a great product.