"You can't really flick through the magazine, because the 4-page insert that includes the video screen is relatively bulky.
"And when you do open up the relevant page, the actual advert takes several seconds to load and play and that's a lifetime's lag in the advertiser's world," he added.
Copies of the magazine containing the screens are being sent out to several thousand subscribers in Los Angeles and New York.
CBS and Pepsi won't say how much this limited commercial trial is costing, but manufacturers Americhip told BBC News that a multi-thousand print run with built-in screens would cost in the region of US $20 (around £13) for each magazine.
This has prompted criticism from some quarters, saying that the internet has already been delivering video-embedded-in-text for some time.
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