This is good for semi-auto pistols... but what about revolvers?

I have to give them a lot of credit for the well thought out approach. This is one of the smarter solutions I have seen and it doesn't seem to assume much.

While I think this is a smart design (with obvious limitations), I still find that "Zombies could attack any second!" kind of thinking displayed here saddening and comical at the same time. Paranoia is truly part of the american way of life. Lots of it.

...Or, someone could break into your home and preparedness can mean the difference between life and death.

But sure. Paranoia. Zombies. Let's go there.

Or someone kidnaps your daughter and thanks to your preparedness and special set of skills you realize you're actually Liam Neeson.
This whole guns-for-safety-schtick has been debated online a thousand times. You know what protects you from crime? Tackling the very real social issues like poverty and racism that cause crime.
You have so many guns and yet your crime rate is so shitty. Mass shootings are routine in america. Where are all the good guys with guns to stop the bad guys when you need them?
It's not working. It simply isn't, crunch numbers all you want. Just look at Canada. They have guns. Yet, they seem to live so much safer lives. Is Mexico such a dangerous place because they don't have enough guns? They got the good Heckler&Koch rifles, you know.
You want to fight fights that I say should be avoided in the first place. Fix your social issues and less people will have reasons to try breaking into your home.
Same with the terrorist. Don't just bomb them, disable their ideological rethoric, disable their methods of recruiting.
We have islamic terrorists here in germany. They either try to build bombs (requires actual know-how) or they attack with axes and knives. Something must be working in our favor here. Same can't be said for the citizens of Paris or nightclub visitors in Orlando. They got shot.
The american paranoia is a reaction to an action that can be made far more unlikely to happen. Once you are ready to tackle the issues.
You can bring a fire extinguisher every time you go to the gas station in case a fire breaks out or you can just stop smoking around the gas station.

i'm waiting for an ED209 to reliably and safely guard my house

I donated to OCP's Kickstarter!

I live in a country where the only people commonly have guns are law enforcers.
When I see this it just seems like a sci-fi movie promo akin to those fake Tedx talks promoting Prometheus, or a fake commercial from Robocop.

It's so alien and strange to me.

Well, that's a pretty accurate description of this clip. Other technology is unproven and unreliable. Theirs is new, unique, and totally reliable. No self respecting science fiction author would stoop so low...you need Hollywood to get this level of "disbelief-required" (or L Ron Hubbard, which is even worse).