Not many years ago I purchased a 24 GHz transverter from them with a 432 MHz IF. I think that a 70 cm IF in mm-wave transverters is a great way to go....
Less than a year ago I inquired about purchasing another one and was told that they no longer make or have available one significant part which is unique to Kuhne 24 GHz transverters with a 432 MHz IF. (I'm guessing that the crucial component here is a specially designed image-reject or I-Q mixer.)
That explains why that listing (and probably many others) has disappeared from their catalogue. Needless to say, I made do with what I already had....
Cheers and 73,
--Doug Friend, VK4OE.