Great retrocore videos. Just watched through several. If I still had my collection, I would definitely save up for a framemeister. The picture quality looks excellent, definitely on par with emulators while still getting the holistic console experience.
Edit: The problem I find with emulators using scanline filters is that many just darken the screen , lowering the visual impact that HD can offer by loading up the screen with black lines. Even when toning the scan lines down, it's still noticeable. I find it muddles the clarity of the game screen so I tend not to use them. Your device seems to do it properly , from what I could see in the video and allow the pixels to come through, the scan lines don't seem like an imposing layer but part of the composite screen. Not wanting to come across as your salesman, just noticed the clarity and the fact that PC emulators sort of fall short in this arena. I don't use them (scan lines)because of this.