Sigh. My previous post got eaten by the submit button.
Anyway, the cordovan leather that Ambrose uses is nowhere near the thickness of Kanayama's, at least from my experience.
As far as the strop Pebcak mentions, I notice that the cotton strap is cut shorter than the leather. I also notice a slight bow in the length of the leather (mine has this problem too). I'd like to see how the hardware end is cut. On mine, it is very amateur, and there is a gap where the pieces are supposed to be clamped together. The gap is big enough for another piece of leather, maybe two. Mine also hangs crooked off the hardware because of where the holes were punched, and it looks like the one in that review might as well.
These are all details that I would expect to be looked after in something that's sold commercially and claimed to be of high quality, most especially because cutting the leather is a big part of making a strop. So, I'd hope that the person cutting would get it right, especially at the prices these are going for new. (For full disclosure, I got mine slightly used, so I make no note of the finish of the leather surface.)