So this showed up on Saturday:
It was $12.43 shipped. Ordered on March 30, arrived April 22. Obvious searches from usual sellers should turn up many variations of this.
No boot up screen, kicks you directly to a text menu with the games in alphabetical order. Only exception I saw was Mario Bros that they grouped in with SMB 1, 2, and 3 which was a nice touch.
River City Ransom is the USA ROM and in English. I played it about an hour and it seemed 100% working. Perhaps it's just wishful thinking, but it seemed like less character flickering than I remember.
Unfortunately, the games I bought this to play (primarily Final Fantasy 3 and Star Tropics 1 & 2) have annoying issues. All the dialogue text in Final Fantasy 3 is garbled so the game is unplayable. Star Tropics 1 & 2 both go completely silent once you get passed the title screen. Which would be a blessing for many NES games but is annoying for those.
Legend of Zelda seemed to be fine.
So, the non-working ones are a real bummer, but the library on this thing pretty much nails the NES. Between this and a 151 in 1, I feel like I have the system covered.