I have several different boots by 5.11. For the most part they are the most comfortable boots I have ever own. Except for the new line of boots. I have purchased and returned each of the new line of boots by 5.11 all for the same reason. They are not true to size.
5.11 Tactical Range Master Boot = Narrow and not true to size
5.11 Tactical Pursuit Advance 6 Inch Boot = Narrow and not true to size
5.11 Tactical XPRT 2.0 Tactical Urban Boot = Heavy and not true to size
I have spoken to LAPG and their customer service is fantastic. With their support I have purchased and returned boots with proper credit applied each time. I ended up purchasing another pair of 5.11 Tactical Advance Coyote.

I have had 2 ankle reconstructive surgeries with possible more surgeries in the future. I am wearing boots for the ankle, arch, and lower leg support. All of which I need now to be able to walk. I currently or have owned Bates, Bellavue, Merrell, Reebok, and New Balance. 5.11 is my personal favorite. I hope someone from 5.11 read this review, because I would like to start wearing more athletic style boots.
5.11 I own for all around ankle, arch, and lower leg support. I wear 6" on good days and I wear the 8" on the days I need more support.
5.11 Tactical Advance Coyote Brown Side Zip Boot, true to size, the most comfortable I have every owned
5.11 Tactical Haste Patrol Boot , true to size, Very comfortable
5.11 Tactical ATAC Boot 8", comfortable
5.11 Tactical ATAC 8" Sage Boot, comfortable
511 Tactical ATAC Boot 6" Low, comfortable
5.11 Tactical ATAC 8" Boot Coyote, comfortable