Although I've only had my i7/16GB/512GB since Tuesday evening, I'm loving it so far. It's such a better fit for me than the SP1/2/3 were. Although I really enjoyed those machines and got tons of great use out of them, for my routine, the setup of the Surface Book is much better. I love the screen, I think the keyboard feels great, it's got one of the closest to MacBook trackpads that I've personally had on a Windows machine, and it's screamin' fast compared to my i5/8GB/256GB SP3, and I especially appreciate having that one extra USB port. I pretty much agree with all of the other reviewers. The total weight of the device is a little shocking when you pick it up. It's almost the opposite of the original iPad Air experience. I remember picking that thing up the first time and being impressed by how light it felt. This thing looks like it would be really light, but when you pick it up, it's just got a heft that doesn't really match its svelte looks. Not saying it's some back breaker, but it just doesn't line up with your initial impression of the looks. Now, once the clipboard is separated, that thing does feel feather light. In any case, I don't just like it so far...I love it!