I have the Tech 10 and I'm very satisfied with them. I wanted the Crossfires, couldn't get them so I bought the Tech 10 and I think I was lucky in the end. They are very protective and trust-inspiring. The ankle protection system in the bootie is very nice, and I like the fact that it's inside the boot, not and external, exposed hinge.
They are very flexible, but not at the first time you put them on (like the Crossfires). However, after using them for 2-3 times they are very comfortable. Last week I found myself in a situation which involved walking for miles in them on various terrain (grass, mud, slopes) and they were almost like a trekking boot. During this walk I learned that the sole has very good adherence in wet grass (not so good in mud).
I like the buckles too, and it's nice they are only 3.
I also like the protective strip for the Achilles tendon which also acts as an extension and twisting limiter. The only boots I know of which also have protection in that area are the Oxtars.
Overall, I'm very satisfied. If I would have the possiblity to get the crossfires or the tech 10, I would choose tech 10 again.