I like the boots but the tread on the sole wears quickly.  I walk a lot and work but I typically have two to three pair of boots I constantly rotate so I don't wear the same shoe two days in a row.  The other boots I wear are also KEEN, just a different model.  Although I have worn KEEN for the last 5+ years, the problem with the Pittsburg and recently other KEEN boots is the sole wears down quickly.  I must admit I have a tendency to drag my heel but portions of the heel are delaminating.  I may have to look for work boots that use a vibram sole for durability.