do you know about any videos showing how to shave with a Gem? Since they say you better keep a good angle with it, I'd like to see whether I'm doing it right. I'd also be curious - although less - about the Slant.
Not sure if he got it done, but a couple of months ago, Mantic posted here about GEM requests, which to pick up for a test etc. I think the majority suggested a 1912, and it sounded like he planned to do it. Don't know if it materialized yet or not.
A video about shaving with a Slant probably won't look any different than a video about shaving with any other DE razor, unless there is a special sub-section about getting your sideburns even.