I'd be interested in hearing whether any of you guys have ever tried actually running in Lanvin (or other fashion labels') "running" sneakers? I've had my eye on Lanvins for a while, but I'd want them to actually run in them, not just as a casual sneaker. Not sure if that's a good idea. I've been running in Kayanos for as long as I can remember. I doubt a designer-label product would be able to compete with a specialist running-shoe brand, but maybe I should try?