In the thread linked below over in Gear Talk, an email from a customer service rep from one of the top boot manufacturers states the following:
"300 miles is a great deal to put on boots, I am not sure of any pair on the market that will take that much of a beating on a trail especially the AT."
I'd be interested in hearing other hiker's opinions regarding expected longevity of their boots. What brand do you wear and how long do you expect them to last? If the soles fell off after 300 miles, would you just shrug and buy new boots or would you expect the manufacturer to replace them?
Link to discussion is here: http://www.whiteblaze.net/forum/showthread.php?t=8909