Welcome to Geekhack!
Typed on my 1994 Lexmark SSK with some Unicomp keycaps too!
The sounds are so similar, I have your video playing in the background as I'm typing this, and they sound exactly the same 
Which of your keyboards do you prefer?
I would drown a toddler for the chance to see an SSK in person. Unicomp *said* they would make an SSK... Unicomp, where art thou?
Right now, the order is: Packard Bell 5130<my modded AEKI(because I can't get it to work

...)I<Dell AT101W<Model M ~ HHKB
Initially I hated the HHKB because it felt like another rubber dome, but the feel and sound have grown on me. In some ways its better than my model M, in some ways not. Just different but still very nice to type on. Both are acceptable for gaming. I play a lot of CS:GO on both boards.
Happy typing.