I like Herro. I think if the price is Sexton and a pick plus salary fodder go for it. I watched some of his highlight vids while waiting for the kids and think some of the stuff he does around screens and dho is pretty scalable and functional with the other guys we have. I think he has some of the same drawbacks players like Poole, Sexton, Clarkson have in that you still probably need a strong defensive backcourt mate who can do some distribution but he might be able to have a development leap where he becomes a poor man's version of Booker (maybe broke man's version when you factor in defense).
Just don't overpay here... that's all... also there would definitely need to be a midseason deal to offload JC (if Key is functional... maybe he sucks outside of the summer league).