I have been lucky enough to have had a TON of boots issued to me over the years. Being on a couple tac teams (one particularly well funded for gear) as well as getting issued equipment from my district, I have had plenty of opportunity to test drive boots.
I would like to add just a couple things to the discussion. First, I am a HUGE Danner fan. They may take a little time to break in, but once they are broken in, they are phenomenal and you can resole them. They are EXTREMELY cost effective when you look at it in that regard... 2 pairs of cheaper boots will still cost you more than a pair of Danners and a resoling. 
Now, while I am a fan of Danners, I have come across dome boots that I like better. I think you can resole them, but I am not sure. I have had a few pairs of Lowa Boots now. The first pair that I bought was a set of deserts. While not planned, the first day that I wore them was for a 15km land navigation route in central Louisiana with 50 lbs of gear and a bolt gun. I didn't even have a hot spot on my feet! While there are some boots that offer this level of comfort, they tend not to last too long. This was more than 2 years ago.
I have since been issued a pair of the woodland brown Lowas that are water-proof and have a thin layer of thinsulate. They are just as good as the deserts. However, I have not had any black, uniform style.
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."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
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-unknown
Working on a PhD in CQB one doorway at a time.
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