I love my SMD Swift '10 and would gladly buy a smaller version. What bothers me about the feather is two things:
1.)Can you get water bottles out of the pockets with the pack on? I can do that with my Swift, Mariposia Plus, and Conduit, but I can't do it easily with my MLD packs, the pockets go up too high, and from the pics the Feather looks like it has similarly high pockets.
2.) I like a hipbelt with pockets, and the add on wing belt adds 4.5 ounces for a medium. This makes the pack 15.5 ounces, which isn't terrible, but my Swift '10 with the sewn on hipbelt weighs 16.65 ounces after some minor trimming. It seems like it would be a lot lighter more durable, and simpler with a sewn on belt.