The battery gets the life sucked out of it in about 5-6 hours on my sister's machine. Been trying to get her to switch to Apple but she is set on the Windows platform.
The Surface also freezes after you detach the keyboard. She's tried phone support with Microsoft and they can't get it figured out. She did listen and will take it back for repair. Luckily she got it at the Microsoft Store about a mile away.
I can't get her Surface to download faster than 165Mbps on my 250Mbps internet service. It will jump past 200Mbps for a brief moment, then level out around 165Mbps. My 10.5 iPP will get 265Mbps down on the same network consistently. What's odd is her upload speed is the same as my 10.5 @ 23Mbps.
Like I said, I love the design overall, maybe even a little more than my iPad because of the ports, but it just seems several things need updates or refinement.
I am 99.9% an Apple guy, but I do have one of the new Surface Pro’s I purchased for work.
It sounds like she may have a bad unit or does she have a 4, not the new one? The battery life shouldn’t be that bad, 8-9 should be more like it. Granted that is still a fair bit short of the 13.5 hour advertised, but 5-6 is definitely not right.
Nor is the keyboard freezing after you detach the keyboard. Since it happens when the keyboard is detached, not attaching, I am guessing it’s not they keyboard.
As far as speed goes, compared to my 2016 MacBook Pro, when used wirelessly I get the following...
2016 MBP: 13ms / 236.22 Mbps / 11.97 Mbps
2017 SP: 11ms / 241.11 Mbps / 13.34
Repeated tests always show the Surface Pro being slightly faster, but close enough that there is no way to tell the difference without running the test.
Best of luck to your sister. I do hope she is able to get it sorted out!