Hi Ed and All,
I have found that the MBHO KA-500's are among the best sounding hyper-cardioids I've ever used. I put them on par with Schoeps mk-41's which I totally dig for less than optimal rooms and when recording from a considerable distance indoors.
Surprisingly, the KA-500's tend to have at least as much bottom-end as the cardioid KA-200's, and possibly even more. If you are interested, we have a sample of KA-500's for the encore of a Widespread set I and II. This makes for a good comparison and gives perspective to how they sound. Drop an email off-list if interested. NO shortage of bottom-end like I've heard MBHO's catching a rap for.
I've only used the omnis a couple times, but they are open, spacious, and detailed.
Happy Recording.
Marc