We are heading to Disney in a few weeks and staying off-site. We plan on spending 5-6 days in the parks and also purchased the Memory Maker. Is it worth purchasing Magic Bands or should we stick with the cards? I have heard that in order to get Memory Maker pictures on the rides, you need to have a Magic Band. If I do pre-order the Magic Bands, can I link them to the cards that I already received on MDE or do I have to go somewhere in the park to do that? Thanks!