Great value for an excellent machine even by today's standards
I loved my Samsung Note 10.1 (circa 2014).  But it could go only as high as Android 5.1, and it barely even ran that fast enough to be useful.  I almost never buy the newest thing, mostly because the newest thing is always too expensive for me.  So I decided to get a used Tab S4.  Holy moly, what an upgrade!  Especially if you bring it all the way up to Android 9 which I think is Pie.  This S4 is like warp drive compared to my old Note 10.1.  Switching apps is fast, web browsing is fast, playing Words with Friends is fast.. haha.  
The screen is excellent, as you'd expect from Samsung.  I know some Samsung phones and/or tablets might have screen burn-in issues but this used one I got, as well as my Note 9 phone, do not seem to have that issue.
My only single complaint about the S4 is the lack of place to store the stylus.  I got a "leather" case which I like very much which has a pen holder, but my old Note 10.1 had a much smaller stylus that slipped into a port in the tablet.  While it was smaller, I appreciated its dockability.  However, the larger stylus that goes with the S4 is much easier to hold.
I don't really play any games besides words with friends, so I can't really comment on it's graphics/video performance.
All in all, the S4 is still an outstanding tablet even though it's a couple years old.  If you're like me and don't want to pay top dollar for the newest thing, the S4 will satisfy you for at least couple years (my Note 10.1 gave me 5... haha).
Verified purchase:Yes