The most noticeable difference between the old Surface Pro 4 and the new Surface Pro 2017 is the latter's improved battery life: more than 12 instead of 7 hours in our Wi-Fi test. No other contestant was able to get even close.
solid; classy design; noiseless; very good battery life (12 - 17 hours; decent camera with support for Windows Hello; very good microphone; bright display with good sRGB coverage; charges in 2 hours; very good performance in short bursts <2 minutes
significant throttling in sustained load scenarios; no USB Type-C; Signature Type Cover (2017) optional; Surface Pen (2017) optional; high price