I don't understand what would be obsolete about firewire. I have listened to people knocking it ever since the beginning. Always wondered what the hate was all about. Even in the early-mid 2000s people argued that it was a "failed" interface, and when it was pointed out that it was generally faster than USB there was usually a speculation that "yeah... but why bother? USB 3 is going to be out by next month and it'll be faster anyway." So these people opted to dis firewire for there own weird biases, pinning their hopes on USB 3 which didn't start appearing on the shelves until ten years later! Failed at what? Obsolete how?

All ranting aside, yes, I use firewire drives, and my Motu 828 audio interface. They work great! What's not to like?