Tom's Hardware published a review on the ASRock Z370 Extreme4 ATX motherboard for Intel Coffee Lake processors A quote from the article:

Can the Z370 Extreme4 balance features, performance, and overclocking against a midrange price for a value victory? Before the idea of an enthusiast motherboard broke completely away from the general consumer market and shot into the price stratosphere, $180 would get you a “high end” board that could be appreciated by gamers and power users alike.

Buyers of such boards would usually get an extra local storage controller, an extra high-bandwidth external interface, and a big voltage regulator that wouldn’t be likely to burn out when the CPU was overclocked. In more recent times, though, “high end” has since come to mean something completely different to enthusiasts. Welcome, ASRock’s Z370 Extreme4, to the enthusiast mainstream.

 ASRock Z370 Extreme4 ATX Review: A Solid Coffee Lake Board for Value-Minded Enthusiasts