Not so Good!
The GNS430 has taken the market by storm because it was the right box at the right time...........it fitted into the hole left by the KX170 and did far more.
However it is not the most user friendly box on the market and is rather too menu based for use in IFR without the autopilot. I find the most irritating thing with it is that the logic seems to have no logic unlike the King products that seem to follow the same logic as most airliner FMC's.
It will be interesting to see if the new King Apex edge products recapture the market from Garmin.