ASUS's line of Windows-based Transformer Book Chi hybrid tablets comes in three sizes: the tiny 8.9-inch T90; the 10.1-inch T100; and the 12.5-inch T300. Our T300 Chi review unit came with Windows 8.1, which we upgraded to Windows 10 during the test period.
ASUS Transformer Book T300 Chi review at ZDNet
ASUS Transformer Book T300 Chi review at ZDNet