I helped my dad list a couple over there last weekend and i know quite a few mates who took advantage of the free listings too.
None of those have been moved at all. All will finish at the standard logical time.
In the past its taken a while for listings to show up due to heavy usage delay (as you would expect over a free listing weekend). A few years back i once waited 2 days for a listing to show up in searches and at other times it would just be hours. As people were losing listing exposure i believe they agreed to start the clock running from the time the listing actually showed up, so if your listing was delayed due to the volume of people using the site maybe you just got unlucky with the times.
As it was free listing though, can't complain too much, but as you implied a plus for ebid, people might just think twice about using them again especially if they had paid and got the same service. Another plus point for ebid, even if you find yourself unable to sleep and do a spot of listing at 2am, you can set the duration in hours as well as days