I have one like that, too--never been dismantled.
Attachment 223605
For me, also, it's a bit on the big side. I'm happier with a 7/8 or even, for some blades, a 6/8. But still, the FBU is something like a maximum, and I felt the need to have one in the rotation. Every razor has to be handled in its own way, according to its weight and shape. The FBU takes more handling, for me, than a smaller razor.
I got a nasty cut early on with it. I hadn't registered yet how much momentum the sheer weight carries behind it. Reminded me of the experience an older friend of mine once told me about. He flew bombers during the Second World War. They had been trained to fly with empty planes. Then the first time they loaded up the bombs, the planes slid around all over the sky. They had to get a feel for the inertia produced by that much weight.