I have been wearing the Magnum Vipers and though they are a comfortable boot after break in they seemed to wear the toe leather out quickly and spread.  Saw the reviews for the Timberland Pro 6" and even though I am not required to wear steel toe boots at work I thought I would give them a try.  WOW!  The day I put them on it was like putting on a pair of slippers and now after 2 weeks of working them they feel even better.  I had none of the ankle pain that I normally get when breaking in new boots.  I wish they had eyelets all the way up instead of hooks but I can deal with that for such a comfortable boot.  I work in the aviation industry and we use Skydrol which is a very nasty hyd. fluid that will eat normal soles right up but it doesn't even faze these.  No slipping either!  I normally go through a pair of boots a year so we'll see if they make it.