Too early to tell, but its clear he has the brains for the job.
I don't buy into the "Presidential appointee" theory of Justices, in which they are invariably judged by the President who appointed them.
I didn't care much for Reagan, but Rehnquist was a solid jurist. Warren Harding is arguably the dumbest and worst President in history, but Taft was solid, smart and competent. Nixon verged on being a venal hoodlum, but Burger was straighforward, honest and modernized the court.