AFAICT, you can order size by overall size (length), but not width(s). And there is no obvious way to compare their "stiffness index" to that of other brands. The online info does not appear to mention custom boots.
So unless I could verify that a particular pair fit me well, and has the support I need, I personally wouldn't order them.
Also, it looks like they have about the same width throughout most of the skate, and I think relative thin, though they do get somewhat thinner at the toe (i.e., a classic "Italian Last" boot) - which would fit some people, not others, and certainly not me - but it is hard to tell exactly from the pictures.
I am curious though - did they seem of good quality? Is the particular skater seem happy with them? I guess that is what matters most.