@Grognak , you're not taking into account a few things in your comment there.
1: While it's true that this is expensive, you have to take into account that it is relatively new technology. (Yes, I know it has existed as small niche previously, but that's not what I'm getting at.)
2: It's a desktop GPU.
3: If more laptops gain support for this, the prices will get more competitive, and the advantages over just buying a laptop that has a better discrete GPU will be less pronounced.
Also keep in mind: You might have two laptops, or a family with laptops, and they might need the extra "boost" to play certain games. It can be shared among compatible laptops. Furthermore, while you might get a laptop that will last a few years GPU wise, you need to remember that this has the advantage of either lasting several years, being upgradable without buying an entirely new laptop. You could even buy an entirely new laptop and re-use it with that.
You shouldn't look at things based on their current state, but based on their future potential. I completely agree though, that the marketing for current products is a bit...or a lot, of fluff.