Rohde Schwarz and Siglent have come up with their latest 1 - 3GHz version of hobbyists grade and price VNA, if you dont run fast i'm afraid they will bite you in the butt leaving you in cold air. ymmv.
i know you people keep busy developing newer and newer and higher end products for profit, but dont forget to improve FW of older models, because we users will help you spread the words in forums etc, and hence can increase your profit, which is your main objective in first place. i wish while you are developing 10GHz version, you can implement technologies such as user settable fringing capacitance and other professional tools in it, and while you have developed the knowledge, you can also include that in older models because of several reasons... (1) we happy user may help you spread the positive words... (2) some new users will not be able to afford higher end model, so they may still choose the lower model such as KC901V or S in the future to suit their needs and budget. ymmv.