As a full-time LEO I am always in the hunt for good footwear. My niche was with the Oakley SI Assault boots. Fit and finish were up to my standards. The only beef I had with them was the fact that they didn't last long. The soles wore out way too fast. I would go through a pair every 6-7 months. Having an extra 15-18# of gear on didn't help either.
My fallback was the Danner GTX boot. Although comfortable, I didn't really like the height of them. 8" was pushing for me. It restricted my ankles too much.

A buddy/co-worker of mine recently turned me onto the Nike SFB. He had the original version with the matte material. The new ones have a gloss look to them now.

Initial impressions out of the box and onto my feet.

1. VERY light in weight
2. These are not a winter or waterproof boot. They are IMO a summertime/dry season boot. I'm sure if you do get your socks wet they would dry pretty fast.
3. There is no ankle support. The boot material is thin and act more like a cover than a supportive "brace" if you will.
4. Heel cup feels low
5. I have WIDE feet and so far there are no hot spots or discomfort.
6. They do feel more like a running shoe.
7. Quiet so far walking on tile. I would clunk around with the Danner boots.

About sizing. They fit me true to size. Don't laugh but I wear 8.5 US. I wear 8.5 wide in the Oakleys and 8.5 wide in the Danners as well.
8.5 in the Nike boots leave me enough toe room without crushing them.

Price paid was $140 (with tax and free shipping on the initial order). You can only buy them online/direct right now at Niketown.com

Well that's about it so far. I'll put them to use this coming Sunday. I'm off for the next 3.. Stay tuned for feedback.