"Either our cartridge is broken, or the DS Rumble Pak is one of the noisiest Rumble Paks Nintendo has ever built. When playing Metroid Prime Pinball, we can hear the rumble mechanism more than we can feel the rumble effects in the system. It's so loud, in fact, that it sounds like a metallic "chirp" whenever the rumble is activated. We'd rather just not put it in the system at all. Good thing it's free, because at this point we wouldn't bother buying it as an extra." Auwch!
Penny Arcade commented on the 'chirp' as well. Hopefully it gets ironed out before the game hits shelves - the idea seems like a pretty neat concept.
