I had to buy this when I saw it. I have several trichocereus species, but I did not recognize this one (if it is trichocereus).
8 ribs, many fluffy hairy tufts from previous flowers that I removed much of.
The spines are thinner and more flexible than the usual spine. They are also quite long, I'd guess 3 to 4 inches at longest.
I could not find anything quite similar in my usual cactus ID spots.
Anybody have any clue?