What about the BCX5 you are looking at- it is not leather?
Yes, the older brown version of the BCX-5 that I have here is leather (lilciffy had asked about the current waterproof model)
And when you say you can take the liner out- do you mean the insole?
Insole. Sorry, I meant to say "insole." I wanted to compare the lasts for the two boots and I could not easily get the insole to slide out of the Alaska. I'd like to have the option of adding a different insole. Now I know that it does indeed come out.
The system of lacing may make a difference over the long haul. The extended lacing across the top of the foot on the Alaska would seem to give it an advantage. With more options in customizing the snugness.