Outside Harry Potter and A Series of Unfortunate Events, I would say that Daughters of the Moon was most definitely one of my favorite series as a child. Lady Geek Girl introduced me to it back in middle school, and once I started the first one, I didn’t look back. I blew through every book that had been released in a matter of days. It had everything I wanted—multiple female protagonists from different backgrounds, a narrative steeped in Greek mythology and magic, and there were a large number of books to keep me interested. So of course I loved it. And one of the things that I enjoyed most about the story was the price that came from having magical abilities and what growing older meant for the characters. However, the writing itself fell flat more than once, and that detracted from what was potentially a really great message.
Time travel is not my favorite storytelling trope, if only because if not done well it can leave a narrative more than a little confusing and hard to follow. This can especially be a problem when a narrative jumps around in time completely out of order and without warning, which is something that both Final Fantasy XIII and The Grudge did. This trope’s big crime, however, is that it all too often results in plot holes or creates events that either cannot happen or that nullify the importance of other events. Worse yet is when the time travel in question has no actual impact on the rest of the story and ends up being a pointless waste of time. A good example of this would be Star Ocean: The Last Hope, where Edge goes back in time to an alternate reality of Earth, blows it up, and the entire subplot serves no purpose other than to turn an otherwise generic protagonist into a detestable murderer.
That is not to say that time travel itself cannot be used well. Plenty of stories have utilized it in ways that improve their narrative and add to the plot and worldbuilding. There is, however, a wide chasm between creative and cliché, and for every good use of time travel, there’s a dozen or so bad uses.