Weight and size. I will be using the device to take notes all day. The tablet portion of the Surface Book clipboard is quite sub-par when it comes to battery life. Then it becomes a ~3.5 pound tablet, which I don't really see the point of. It's also a bigger footprint then I want to go with. I actually prefer the S3 size, but I like having a non-removal keyboard, just one less thing to deal with. First impressions: Very nice build. Really light, pretty unbelievable we're at the point of 2.2 lb laptops. Screen is nice, hinge is smooth and rattles a little bit, but that's just the watchband hinge (first time using a Lenovo machine with one of these). Keyboard travel is very shallow. I'm getting used to it already, but the keyboard cover for the ZC and Type Cover for S3 feels better than this. I'm sure I'll get used to it, but it's not the best, and I'm missing keys sometimes when I type. Pen/digitizer activation is REALLY LOW. I think this may be the lowest I've used so far. Why is it so low? You seriously have to get right above the screen for the pen to register. This is Wacom AES right? It can't be like this on ThinkPad Yoga 260 and others? I just tried it briefly in Windows Journal, but I'll get OneNote on this thing soon and see what it's like in that program. Charging it up now and will get a better feel for battery life with BatteryBarPro. Let me know if there's anything else you guys want to see.