Smart is the type of player that will change the culture of your team. He has that KG intangibles and will be one of the better perimeter defenders in the NBA for most of his career.
I'm not sure his upside is as good as McLemore or MCW, but he's definitely the safest prospect of the three. imo, his floor as a player is.. Hrm. Whatever player that will give you great defense, good playmaking, strong rebounding, and inconsistent offense at the 2-guard position.
He still reminds me a lot of DWade. Not saying he will be as good, but their playing styles are very similar.