400 kbps sufficient for a high-quality 4-way videochat?

Hi!
Apple's technical specifications on iChat AV state that in order to initiate a 4-way videochat 384Kbps (up/downstream) are required. A friend is moving to Europe and the maximum (affordable) upstream he can get is 400 kbps. He will have 17 Mbps of downstream bandwidth and got himself a Core 2 Due iMac with 2 Gb ram. So while I assume that he fulfills most requirements, will a 4-way video conference with 400 kbps upstream work nicely or is he merely fulfilling the minimum requirements? Is he heading for a slide show? Does anyone have any experience with 4-way conferences?
Any thoughts on this are greatly appreciated.
PowerBook G4 1.33 Mac OS X (10.4.8)

Hi,
I could do four ways as Host with 256k up and 1Mb down so he should be fine.
(the video quality drops off if one party is slow)
8:51 PM Saturday; February 10, 2007

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