It is hard to talk about picturequality and zapping speed. I dont know what you call a good quality, or fast zapping...
All I can say that I am realy happy to bought one! For me the picture-quality is good and the zapping-speed is OK. Yes, it could be faster, but I owned STB-Receivers for much more money that were much slower!!
As a result oft all that, I would never buy an other STB-Receiver again. The Meecool K1 Pro withe LibreELEC on it, is just a dream that came true...