Heres the Westin HDX installed on my 17 LTZ.
Fairly easy install, would have been a lot easier if the damn brackets were labeled, didn't even use the instructions as they were not very understandable. Also had hell getting one of the bolts started, ended up being some slag inside of the bolt hole on the running board.
Not a fan of the way any boards look but couldn't justify the Amp researches, i also have a a very expensive gun and watch addiction I need to feed lol.