I have one, and with some adapters, I got it going in my DK. I'm working on creating a PC-based HyperSpin setup in there with a custom built CP (Robotron is calling to me) and I'll be retiring this sucka once and for all.
The emulation is bad, the game selection is questionable (a third of these "classics" are junk that would be at home in a Crap tourney), and the menus/music are pretty wretched. It more or less gets the job done though if you want all of your Pacs and Kongs and Dos in one place.
The thing that amazes me about these boards is that such a weak product has such a deathgrip on the market. How can it be that, in the years since these have been released and been so successful, nobody, across that big length of time,
has ever made a superior product at around the same price, when the bar set by these boards is so low? Something with more/better games, a snazzier, more HyperSpin-like menu, and a core based on a MAME version that isn't a decade and a half old. I guess everyone stateside is afraid of being sued, but c'mon China, go for it.