Ultracart.com also has 1 click upsells - very good software.

I'd be interested Charles to know how best you would setup multiple upsells/downsells before you sell 5000 items on CB (per their 1 click upsell requirements)?

Or if there is an exception granted, I would be interested on how to get it.

I was told Mobile Monopoly did NOT have the 1-click upsell capability but they had multiple upsells and downsells. I should just buy and see how they do it.

Me, I have a link at the top that opens in a new window to get the product, and then an upsell video below with upgrade button. It works well, converts 20% (could depend on the offer) ... but works well so far for CB. But, I'll likely switch to multiple upsells and downsells and maybe even use the same technique with yes/no button below videos.