Tzimisce,
There are about 4Million iPads sold since release and 600 votes are about 0.015% of them.
If all the users of this forum would suddenly vote on this poll the percentage would rise to 0.9%. This is quite low for a significant statistical population sample.
More than that, this population has a strong bias because they are writers on a Forum and "write on a Forum" is an activity that depends on the social category of the person that is a cultural and age related fact.
This is an interesting poll but I belief it is not a good statistical sample for the iPad owners population.