What company does the best product demo videos?

Not the highly stylized ones (although those are cool, too).

I'm talking a person walking you through the features of a web, but especially a mobile app.

Think Loom / Screen Studio but with really high production value.

Related -- for a video like this

1. How long does it take to make 1 of these?
2. Approximate budget?
3. What kind of agency / firm makes them?

Related -- for a video like this

1. How long does it take to make 1 of these?
2. Approximate budget?
3. What kind of agency / firm makes them?

https://www.youtube.com/watch?v=plk98O3JUA8