2 days I managed to finally get a group through Heroic Sethekk Halls and get my Swift Flight Form, and I'm really at a loss for words for this. It is like getting the joy of getting Flight Form all over again!
One thing I can't help but chuckle at is the momentum you get flying. If you shift out while zooming forward, you actually continue forward in caster form like a run away cannonball from the Darkmoon Faire. Hitting the new insta-shift to go into bear with that, followed by Feral Charge, has coined the words "Bearpedo" and "Bearsle" rather than bear bomb with some of my friends :)
Also, hooray, I no longer have giant night elf ears in my bird form ;)
If you've been holding off on getting your Swift Flight, start saving now, it's worth every gold.