That's too bad! I think people, runners especially, have been conditioned to replace their shoes every six months or so. I think a shoe in the $150 range should last years not months. You're right, even styles can differ a lot within the same brand. I've been wearing my New Balance now for a couple of days and, honestly, they aren't great. I'll probably try the Brooks the next time around.
RE: Spring and Grönsakskaka