I seen that too, I would like a fermentor for 10gal batches so the 15gal one looked like an option for me.
It seems the kegmentor with the TC fitting on top might give a few more options for cooling. I use a beverage cooler right now for 5gal batches and moving to 10gals would require me come up with a new cooling solution so that is why I have been dragging my feet.