I did a clean install of windows 10 build 10125 on to my Asus G750Jx Notebook and was impressed with the speed of the installation.
I have also taken the risk of installing this build on my main PC. Installation was much shorter than any previous builds. I am impressed with the new look and will give a stability report in a few days
Of course I have a complete system image of Windows 8.1 with all programs saved to a backup drive, so if there are problems I can restore to Win 8.1 in approx. 20 minutes.
Here are my WEI scores for 10125. This is on an Asus P8Z77 Motherboard with Intel i7-3770 CPU & 8G DDR3-1600 RAM & Nvidia GTX 570 video card & Kingston HyperX 120G SSD.
System Score 8.15
Memory Score 8.4
Video Encode Score 8.5
Graphics Score 8.3
Dx9 Sub Score 9.9
Dx10 Sub Score 9.9
Gaming Score 9.9
Disk Score .15