My initial posting at start of group had some impression about physical device and package, you can read it.
About the RAR file with software and documentation, that is new for me today, I have downloaded it and started to use it.
So far I think it (device and software) will be useful. Software has english and chinese (Mandarin?) option for navigation language, that is good. The software seems stable (no crash, no hang yet), and seems run well (fast enough) on my very old low-function Windows 7 laptop (small display, slow CPU, small memory, etc.) Software application exe file is very small about 150K, has a few files required with it, just copy small folder from RAR to machine. No need for windows MSI/EXE install, it is not in your start menu. Device driver was not required on my machine (STMicroelectronics serial port), but .INF file is included in RAR. PDF document is english language, I have started reading PDF documentation and I think so far it is helpful. NanoVNA device and PC software both pretty easy for me to start using without documentation.
Users with more experience and expertise about VNA can provide more precision detail than I can right now. I hope more people will try it and provide advice for uses.
Small detail noticed - Smith chart display mode on the software uses a bit-map background from PNG file (rather than draw the smith chart outline using vector graphics in software) - all other format is vector - so smith chart image is not great, and when measurement data causes data display to only single point (like ideal load, open or short), single point is not clear on display, sometimes not even possible to see on display (small dot with weak color), but maybe that is my very old computer. Also, marker function in software is basic, you hover mouse pointer where you want on smith chart then you see small window with parameter - it is useful.
