i'm switching out my 8600k, z370 setup tomorrow after ordering the 2700x and a asus crosshair VII x470, during my initial testing was looking very good compared to the 8600k after updating the bios, plus the 2700x will boost to it rated 4.35gz via xfr, if you leave the chip to its own devices the bundled cooler is more than enough to cope with the heat, its super quite as well, plus gotta love that rgb XD, if you plan to manual overclock then definatly swich out the cooler it sound like a jet engine and your cpu will hit 80+ degrees like mine.
almost forgot, buy a dual channel ram kit as the new chips dont really like fast quad channel kits as i found out the max under dual channel is around 3466mhz but quad channel seems to be stuck at 3000mhz