What I read here concerning sound of Rockchip devices maybe can be acceptable when no Meizu device have been heard.
Kindly clarify what rockchip rockchip are you talking about. If you are taking of that devices that uses a Wolfson audio processor, maybe I can agree with the awesome sound you said. I insist, Teclast did have to implement Wolfson to obtain a better sound of their Rockchip devices.
But I do have a rockchip Teclast C260 capable of play FLAC files (also APE), which are lossless formats and I have compared it with my Meizu M3 and there is no point of comparison in sound quality. This is not my only opinion is also Tadad1 in his excellent review
here.
Maybe iixorbiusii for a personal reason just dislike Meizu M6, but it's not me who claims for the best sound of Meizu, is also Tadad1, and the engineers of Teclast, choosing a better audio processor for their best products.
Maybe about video he is right, as I haven't see M6 videos, but I've watched lots in my Rockchip devices, and I have get really satisfied with its performance.
Concerning FM reception... sorry iixorbiusii... what I've get from the Rockchip is even worse than Action devices. I am not talking of the capability of reach some stations, I am talking of the resulting sound and interferences, both tested in the same place... my bed.
I simply believe that for a personal reason you just hate Meizu products, based on your FM reception review, that is not in any way good for our readers, who wants objective comments.