Both of them were allowed to download fully before watching, because my DSL connection is only 3Mbps and has lag from hell.
I wonder (1) whether this affects people with higher download bandwidths and (2) whether the receiver knows you're going to watch it later. Perhaps the adaptive streaming part radically reduces consumption to keep up with real-time viewing, even though nobody is actually watching. Regarding (1) my iVOD HD is great, and the iVOD SD is WAY better than satellite SD; it's more like DVD-quality SD.