Hi Andy,
I have used one as a signal generatyor covering 54 MHz to 13.6Ghz which I have foung useful in the shack.While it does not have the PN performance of a professional surplus unit I can at least lift it easily with one hand and it does not occupy much bench space. Details are at https://gm8bjf.joomla.com/articles/19-a-52-mhz-to-13-6-ghz-signal-generator-based-on-the-adf5355

73s
Brian GM8BJF