Kotaku gave the system and resounding "meh" while Kotaku basically think's it's terrible. How is it actually? I'm not sure, but it's a compelling system with actual Sega Genesis playback and the 85 included games is a compelling prospect. I think i'm going to wait for some Amazon reviews of the system before I decide to pick it up but if it even has average reviews I think the value might be right.
https://www.polygon.com/2017/10/13/16051258/sega-genesis-flashback-hd-review
https://kotaku.com/sega-genesis-flashback-hd-the-kotaku-review-1819380165

Wow that's seriously dumbfounding in some cases. The menu most of all.
Sad.