After having flown with the D10A EFIS for a while in VFR and IFR conditions it appears to me that one has to focus on the number being displayed in the VS (Vertical Speed) box to determine a climbing or descending trend. If the VS were displayed as a colored vertical tape adjacent to the altitude tape with the scale being programable it would be much more user friendly. It should be similar to the rate of turn tape only orenited vertically.