Some time ago I started a thread asking about the Lenovo Yoga ->
http://www.audiocircle.com/index.php?topic=145735.0In the end, I decided on a Microsoft Surface Pro. Mine is the "old model" i.e. Surface Pro 4. For me, this is a second machine so I wanted something super-portable. My primary machine is a 15" MBP.
Super good stuffI love the form factor. I did not buy the Microsoft Type Cover. My previous impressions of the Surface were colored (in a bad way) by the Type Cover. Toss the Type Cover and the Surface Pro itself is a beautiful piece of engineering, easily Apple standards and probably better (JMHO).
Instead of the Type Cover, I bought a
Logitech K810 keyboard and a
Logitech T630 mouse. Both of these are very light and work great. The keyboard can be paired to 3 bluetooth devices and the mouse to two.
I got a Crumpler Skivvy S bag. The Surface Pro 4 fits in it perfectly, as does the keyboard and mouse. I'll post a picture sometime but it's such a compact and lightweight package I scratch my head every time I pick it up to take it somewhere.

The thing I love about this is that you have "levels of engagement." I can take the Surface Pro out of the bag and use it like a tablet. If I need serious typing, I take out the keyboard and turn it on. If I need to draw something I take out the mouse and turn that on.
Yes, you will read criticism of the Surface Pro when used as a tablet. For example, the onscreen keyboard could still be improved. But the way I've just described using it bypasses that.
It's a proper Windows 10 Pro machine with a beautiful screen.
When it comes to really portable yet actually useful computing devices, Apple has lost the ball as far as I am concerned. The Surface Pro is what Apple should have done. Instead, they just made the crippled iPad bigger, and did away with the 11" Macbook Air (after never giving it a Retina screen).
That's a lot of super good stuff!
Good stuffWindows 10 is pretty good. I've jumped back and forwards Mac-Windows for 30+ years and am not really religious about it. But since OSX I have a large investment in it. There are things I'm still working out how to do on the Surface that I can easily do on the MBP.
Performance is fine. This machine wasn't bought to be a powerhouse but I've not noticed any performance issues so far, except for X-based applications like Inkscape. Oh, it's the i5 version. The 2017 model is supposed to be a bit faster.
It actually works well in "laptop mode" with the stand out sitting on my legs, keyboard in front, and mouse on the chair arm. It's a little unwieldy compared to a laptop but I've gotten used to it.
Not so goodBattery life is not super. I felt that it "could have" been made a bit thicker and heavier to fit in a bit more battery capacity. However the current 2017 model is claimed to have about 50% greater battery life.
As I said before, don't buy the Type Cover. It makes the Surface Pro feel dinky and doesn't do it justice. Also, it's expensive.
I haven't used the Pen for anything useful. Fortunately with the Surface Pro 4 it was included (not so with the current model).
You can't really get a useful "case" for it AFAICT. I bought the Kensington "Black Belt" case and it makes it top heavy when using in "laptop mode." Reviews on Amazon indicate other cases don't work that well, with issues like screen breaking when removing the case (!). Hence my decision to stick with the nice Crumpler bag.
And... that's it. Not so many not-so-goods at all.
SummaryI'm not sure why I haven't heard more about it. I think it's a brilliant machine.