I think its a great product but I'm less convinced it can be a laptop replacement for some (many) people unless you full flesh out what it can do very well and its short comings.
It's an awesome tablet, I don't get why people say differently, but that's just my opinion. I bought mine as a 75% tablet, 25% laptop device.
My personal opinion? I think it's potential for awesomeness centers mostly on how much mileage you intend on getting out of the stylus. If you plan on using the stylus more often than not, it is a far better deal than an MBA or an iPad. It's thin, it's light, and it has the power to do a goodly amount of heavy graphics work.
I've heard of people doing full sculpts in Zbrush on an SP2 without any issues. That's impressive. And the touch friendly SP3 specfic rev of Photoshop definitely sweetens the deal. For this type of work, there isn't much out there that can match the Pro 3 for a light, on the go solution.
But for everything else, it's merely alright at best, and that's the biggest problem with it. For the Surface Pro line to really succeed against the likes of the solid jack-of-all-trade traditional laptops like the MBA, it needs to have its own strengths, but no comparative weaknesses. In other words, it can be better at some things than the competition, but it can't be any worse at everything else.
That's where it fails. It's not a bad machine at all, but it's too specifically aimed at one particular niche to be a widespread success. It needs to be good at art, and typing documents, and spread sheets, and so on and so on for it to truly succeed.