I have an all King set up with a KDM150 MFD/GPS and a KLN 94 "IRF" Gps. The 94 displays on the 150 which in turn links to the auto pilot (old century 11B) and jpi engine monitor.KMA 28 audio panel, 155 and 165 nav coms K(?) 64 dme, king 525hsi.etc.
I can look at the moving map 150 and get all the other features of the 94 at the same time.I also got redundancy as they can both work as gps's independantly so if one drops out I got the other.
Apart from the reservations below its the dogs for VFR and IFR
I was a bit pi**ed off with all concerned as the KDM 250 was released on to the market a few weeks after I had mine installed.
That has more functionality than the 150.No one told me it was comming.
If I had endless cash my ideal would be 94/250 linked plus the latest data link mode s transponder (which will display traffic on the 250 but not the 150), plus the 825 electronic hsi plus weather.
King were reasonably helpful apart from the 250 issue but an installer is where you would get the most usefull advice. Allow between 1/3 and 1/2 as much again for the cost of fitting.
Have fun