I have an E585 (bought it with the 2700U and 1080p screen upgrades, but added my own SSD and extra RAM because Lenovo charged the moon) and it replaced an X230 Tablet.
Even though it's the "upgraded" screen, it's still dim and disappointing. I understand very few Thinkpads have excellent screens; while the X230T's was brighter, it managed to burn the browser chrome after a few years of using it for lap-surfing.
The X230 had a slide-off-the-back-side battery. The E585's is inside the case. You could slide open little hatches to access the storage and memory on the X230. The E585 was a single-piece cover with 8 or 9 captive screws and then has to be pried apart with snaps.
The E585 has a rubber foot to prop it to provide clearance for the vents; the tape holding it on gave out a couple months ago, so I've stuck little white adhesive rubber furniture feet on it.