I have been waiting for a smaller Windows computer for years. My 13" Toshiba Portege is too big. Surface Pro 3 is too big, Surface 3 is too big, Dell 8" Windows tablet is too small. The screen size of the iPad Pro 9.7" and iPad Pro 10.5" are darned near exactly the size I want, but the most important program that I run (a statistical analysis package called SAS) is Windows only. I like my iPads, use them a lot, but can't use them for the class that I teach.
I plan to go to my local Best Buy on release day to touch and feel. However, I'm eligible for the educational discount and our state's tax-free weekend (save 4% state tax) is 8/3-8/4 so I will probably make the hour+ drive to the nearest MS store either Friday or Saturday to take advantage of that, plus there may be some bundle deals.
The configuration I want (8G/128G) with accessories is going to set me back in the neighborhood of $1100 because I'm going to have to get the dock; I have to be able to connect a microphone headset and external video for recording some lectures. I will also need various cables and adapters in addition to the TypeCover and pen, not sure about a mouse yet. I also must upgrade to Windows 10 Pro because the statistics software that I teach and use does not run on the home version.
Based on the measurements listed in the specs, the Go is almost exactly the size of my iPP 9.7 in silicon case with Apple Smart Keyboard, which is a nice size for me. The Go will have a slightly larger footprint because the keyboard has the touchpad.
On the one hand, I wish I weren't planning to spend $1100-1200 for a new toy. OTOH, I once spent in the neighborhood of $6000 on a color VGA Toshiba portable... Yes, I could get an ASUS (got one for my fiancé), but I like the Surface form factor.