I found one of the Turtles cabs on display over the weekend, my daughter and I jammed on about half the game.
It seems like they've improved the controls, which was my main complaint from the Galaga and Centipede ones from last year I tried out. They're still not arcade quality, but they're on par with like a Mayflash stick or something, using lightweight arcadish knockoff components, they didn't feel bad although I'd probably still swap them out with something better.
I could be nitpicky about the LCD screen and size and stuff but to be perfectly honest, my daughter and I had a blast on it. I wouldn't buy one for myself, I'd just use a Pi or something, but I see the appeal.