The two brands of ink here are the Dalery-Rowney Calli and the Pelikan Fount India.
Fount India is very similar to Calli but it is not waterproof. It's opaque and lightfast. I've seen it being wrongly marketed as waterproof on many websites (except Pelikan's). The plastic bottle comes with a sucker for sucking ink. This ink is made in Germany.
This experiment is set up to test how waterproof they are. I've used a water brush without any colour pigment.
As you can see, the Fount India ink smudges instantly with water. So don't get the wrong ink if you're doing watercolours. Calli is pretty resistant to water but doesn't seem to work well with Copic markers. Fount India works well with Copic.
The bad point about both ink is probably the thickness of the ink. I'm using them on a fountain pen with ink reservoir. The flow of the ink is not as smooth as I was hoping for. The ink can run out while writing/drawing because the ink has stopped flowing even if there's still lots of ink in the reservoir.
The good thing about both is they are very affordable.