I have never spent so much on anything for my feet, but I'd do it over again.  I do some trailrunning and log short, fast runs on pavement or treadmills - these shoes have handled everything well.  I've been wearing nothing but running shoes (and boots for work) for 10 years, but I've never felt like I was running on a cloud before... 2 months into ownership (~300 miles) the initial "cloudiness" was gone but they're still an 8 of 10 in comfort.  That feeling might have lasted longer if I didn't do some weightlifting in them.  I never realized how much my feet fatigued during runs until these shoes removed it.  Coming from a long string of $50 shoes I think I improved my speed, motivation & endurance as a result of decreased perceived effort if not the physics of a superior shoe.