I second the effectiveness and pleasantness of Hyundai's implementation. My 2015 Sonata has those features (its standard now, but was introduced that year for the Limited trim). It, combined with auto-hold to apply the brakes when the car stops, made road trips and slow going commutes so much more pleasant. It sucks for stop and go traffic, since it disengages when the car completely stops. But I can't fault a cruise control system for sucking at a scenario that doesn't actually involve cruising.