Most warn that DualDiscs may not play on their equipment, particularly slot-in devices where you insert a disc and the machine grabs and pulls it in. Some warn that the DualDiscs could get stuck or scratched. JVC and Onkyo flatly tell their customers not to use DualDisc products until further testing can be done.
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''We've seen almost no problems at all. It's an infinitesimally small number of complaints compared to the million discs we've sold," said Thomas Hesse, president of global digital business for Sony BMG Music Entertainment, which makes and distributes DualDiscs.

As for all the warnings about playback problems, including those from his own corporate parent, Sony, Hesse said: ''It's a red herring in my mind."