I also prefer cases where you screw the drives directly into the case, so the heat can transfer easily from the drive to the metal case, rather than using removable drive bays or other drive mounting methods that involve screwing the drives into plastic rails, etc.
This looks reversed. I just looked it up and it's the same as the Pro 2. Four out of the box for 3.5, but can be expanded to twelve. Plenty of room for 2.5 out of the box though.The Phanteks Enthoo 719 will hold 12x3.5 and 3x2.5 with the basic layout. I could easily add 6 more 3.5 drives and likely 4-6 more with a little modification. It's a very roomy case with lots of ventilation and fan placement locations.