I bought one at the local Gamestop. It was the last one they had, and at $10 I couldn't resist.
I'll need to fire up my antique version of MAME to compare speed and accuracy, but I like it so far. It's nice to see some less well-known classics finally getting some attention.
Qix seems to be the least accurate of the games, which is a pity since it's one of my favorites. Colony 7 is as hard and fast as I remember it being. Phoenix is a little off, but still fun. Space Invaders is, as already mentioned, more like the Anniversary Edition re-release than the original. Lunar Rescue is a hoot, and my stick, at least, seems to have the "woowoo" thruster sound, as it should.
BTW, any idea what hardware is running this stick?