Haven't had a lane opponent who beat me yet, in my 14 ranked games (11 - 3, all 3 loses was 4v5, so he is pretty damn legit)
Hardest ones i've faced was Lee, going aggro on me, with early vamp scepter, he could sustain as much as me and had more dmg, still outfarmed him tho. Raped akali when i was versus her.
If i meet one, i'm gonna try with Nasus, he seems like a good counter imo.
Also loves to afk farm in another lane, gets huge aswell, got insane sustain (q starts healing 100+ a Q quite fast), and benefits from building large amounts of armor, and wither is quite good if your jungler comes. I'd say he sounds very viable, haven't played the matchup on either end though.