Very good!
I really had mixed emotions about the animation in this. There were some parts where it looked a bit too cartoonish and off model, but overall it did a good job of capturing the characters. I was also wondering why it was even about "Sonic X" but then you threw in Lecoe and Becoe. The action scenes were pretty impressive and I liked that weird shiny super form Sonic was in. I knew the guy in the cloack was Knuckles and cloaks are some of the best clothes for characters to wear. It was also nice to see some cameos by other characters like Amy.