I didn't read this thread but generally I'm optimistic about Harris. What I don't like is he's kind of a head down driver. When he decides to go, he's going to shoot, and he'll only rack up a 5th of the vision passes Deron used to make. He also doesn't have anything close to Deron's arsenal of stop and pop, and his jumpshot is pretty mediocre.
On the good side, he's lightning fast, a willing passer, doesn't look like he's gunning for numbers, and has the right mentality. And to repudiate my point above, he's actually a pretty good driver from what I saw. He beats his man so he's always getting a solid shot up close, he's just not the world's greatest finisher. I think his defense is also going to emerge as a major plus.
On vision, he's not elite. But he's smart, he won't try to do too much, and he'll play to win which I like.