I game on my couch but I couldn't see myself using this.
I have my keyboard on my lap and on the arm of my couch for my mouse I use a thin square piece of wood that I cut to the size of my mouse mat and glued my mouse mat to it.
This couchmaster is a good idea, but it is a bit expensive for what it is. You could make something like it easily for much less money.
NZXT Switch 810 - i7 6700K - MSI Z170A Krait - 32GB Corsair Platinum SE - MSI 1070 - Crucial MX100 256GB SSD - Samsung F3 1TB HDD - Corsair H100 - Corsair RM1000i SE - Asus VE247H
PC Audio: Asus Xonar STX - Sennheiser HD650.
Portable Audio: FiiO X3II - Audiofly AF140 - Etymotic ER4s - Fidue A83.