The Knuckle guides have worked well, though they do require some modification (slots) to make it easier to insert the housing. With the slots cut, it was possible to insert/remove the dropper post and mechanical brake without loosening any Allen bolts.
The biggest benefit to these is the fact that they reduce any chance of rust, in a rust prone area. They also keep the cables a bit further from the top tube, so there isn't any housing scuff or annoying cable slap noise.
They aren't the best choice for hydraulic brakes or interrupted housing lines obviously.