I've got a few Cheyenne hours and (on those that I flew) the Rad Alt is max 2500'. It was set at each stage of a stepped approach to the rounded up MDH AGL for that step and worked in concert with the altitude alerter and GPS Alt Alert. They also have both aural and visual warning (light and dinger) as well as the actual readout on the instrument and a digital readout on a display at the bottom of the VG. I found it hard to miss those cues, but at typical Cheyenne approach speeds those cues change pretty bludy fast when the're reading directly below you instead of forward of your path.
