Considered buying this model, but bought other brand instead.
GX400 is NOT really made by Panasonic it's OEM and rebranded as Panasonic. Here's youtube link
https://youtu.be/KL71Cs8Oo0E with a local user review of 50GX400x,
Picture Menu and overall GUI is different from Panasonic's and the user had problem with wifi password limited to numerical passwords only. Panasonic put its name on these TV's maybe good quality din, with HDR and IPS panel with 2yrs warranty.