I am enjoying my Surface 3 as well. I won't reiterate what others have said because so far everything is spot on regarding speed of the device, quality etc.
Some things that surprised me are....
1. The keyboard is really good. I would say the keys have less travel than a MacBook pro, but less side to side movement and a LOT less clatter. This is a very quiet keyboard. The trackpad is amazing! It is much better than any windows trackpad I have ever used. The trackpad feels on par with MacBook trackpads.
2. There is more flow to using this device than using an iPad. I have owned iPads since the very first one and they still feel essentially the same today in functionality. You open an app, use it for a bit, then hit the home button to get out of the app. Swipe left or right to get to another page of apps then open another app. Everything is very segregated. To me, using an iPad is like going to a fast food restaurant, ordering a burger, eating the burger, then ordering some fries, eat the fries, then order a drink, drink the drink. So far, using the Surface 3 is a very smooth flow. The start panel has all my programs, I click on a program and then if I remember that I need to do something else I hit the window button on the right and transition back and open something else. I can then go back and forth using the window on the right. It may sound like a similar experience to the iPad, but the whole process has a much smoother flow. It is difficult to explain.
3. Usability of the screen area. None of the reviews really talk about how the 3:2 screen ratio + 1080p results in using most of the screen when watching videos. When watching a 1080p video, I am using most of the screen. With an iPad, a 1080p video uses about half the screen with giant bars on top and bottom. Additionally, reading websites is much easier. I no longer have to swipe left and right to read paragraphs. I just scroll up and down.
4. The keyboard only feels necessary if I am going to use the device for productivity. If I am going to use the Surface 3 as a consumption device like an iPad, the keyboard isn't needed. Most reviews make the keyboard sound like it is absolutely necessary. The on screen keyboard is perfectly capable and I would say is on par with the iPad on screen keyboard.