A couple more notes:
1 - If your primary use of the nanoVNA is HF up to about 450MHz, then there is no need to buy a new model. I am still actively using my nanoVNA-H4 from 2020, and it is all I need for HF/VHF work. If you plan to use a vna at 900MHz and above, you do want to get a model that handles the higher frequencies better, such as the V2 models or liteVNA64.
2 - I also normally subscribe to the "if it ain't broke don't fix it" model - but the newer firmware for the H4 has extended its functionality quite dramatically. So after you have a good working relationship with your H4, if you want to have more functions to play with, do upgrade to the latest DiSlord release of firmware from here: (get the one with H4 in its name). And if you have not recently done a firmware upgrade on a device like this, you will need to make sure you have the correct driver installed, so please read the firmware update instructions in this group's wiki, and this document that I put together some time ago to make sure you have the correct driver:
/g/nanovna-users/files/Miscellaneous/DFU-mode%20Driver%20for%20Win10Win11Stan
