I bought these exact same shoes 18 months ago and the only reason I really replaced them was because the rubber tread was finally coming apart.  I am a contractor and I wear these all day every day for a year and a half.  I was going through shoes every three months in the past, so these are definitely worth the extra money.  my only complaint on this pair is that they are a little narrower in the toe compared to my previous pair.  I guess the company is trying to save money by shaving off a couple millimeters of width.