I know nothing about it, there is a thread about it.
https://www.tabletennisdaily.com/forum/showthread.php?25656-Pongfinity-Sensei
There are hundreds of reputable blades and rubbers from different manufacturers. They have been designed by experts and tested by a wide range of players in different countries. We know those products more than a pre-made racket.
There are also thousands of pre-made rackets in the world, only a few of them are good rackets. I think Pongfinity rackets would be one of the good ones. But those good pre-made rackets are usually re-branded blades and rubbers of existing products from other manufacturers. They assemble them and charge you premium for saving your time to know different blades and rubbers. And you will also lose the chance to discuss table tennis equipment with others, because you don't know what blade and rubbers you are using.