mlee 2500 :
Very cool...Congratulations SilverStone, it's nice to see someone innovating in this space.
I used to build Small Form Factor PC's for myself, but gave it up years ago because I had to make too many sacrifices versus with a more traditional footprint (PSU's just being one of them).
However SFX *can* be a viable platform, even for serious gaming, if done right and component makers are willing to invest a little in addressing the constraints associated with it.
If I may, things changed a lot over the years. A case like Silverstone's own SG13 will fit a full-sized ATX power supply, full sized GPU like the 1080Ti and any ultra high-end CPU with water cooling at max performance and with no thermal constraints, in a case the size of a shoe box with airflow beating many ATX cases. I don't think there are many sacrifices to building small these days, unless you need more than 2 drives, more than one m2 device, more than 2 RAM sticks etc, or otherwise deviate from mainstream high-end. Then you can build with mATX, as it delivers every single feature of full ATX in half the size.
Unless you actually prefer your computer to take more space, I have a hard time recommending anything but SFF these days. To a point, as you can go so small that you have to make sacrifices. But you can go to 1/4th the size of your average ATX case while not making a single performance downgrade or having to rely on any non-standard hardware choices. I crammed my whole 4K-gaming ATX setup as is (minus motherboard switch and CPU upgrade) into a case 20% the original size only last year and felt rather silly about waiting so long.