I interned with him. He is extremely sharp witted and treats everybody at the office as an equal (a rarity these days). At lunch, which he would mostly have in office with his juniors, he'd would share several humorous and informative anecdotes. He is also very warm to his interns. Quite a conducive environment to work in, in my opinion.
Never worked in his Chamber but have briefed him many times. He is a gem of a human being (I've known him for over 15 years). He really is also very pleasant and at the same time hard working and superbly prepared for every conference. His juniors also are nice to work with and I've always had positive vibes when interacting with all of them.
So in summary, go for it if you have an offer :)