Cons:
- Coal crumbles extremely fast
- Burning time is limited to 15- 20 minutes
- Disgusting taste of its own, which completely covers the taste of tobacco
In summary:
Actually, this coal would be acceptable and could well shorter Shisha - do with it sessions. However, you can taste in every train a very distinctive charcoal flavor, this is the coal after 5 minutes begins to fall apart, and far too much to ashes. This always comes much ash in the head even when the holes are stung very small.
To check if the claim is consistent with the natural taste of charcoal I have repeatedly taken 3Kings instead of coal, at the same hookah. Lo and behold, with 3Kings you could taste the tobacco again as it should be.