Mages use them a lot because they have high magic level and weak melee and it does nice damage, so a mage can kill strong monsters such as Cyclops and Minotaur Guards without getting damaged.
If sorcerers plan on making them to sell, they are recommended to make until you become level 45 and can learn the spellSudden Death as many people buy them and they cost relatively little mana.
Druids should make them to sell until level 28, because they can make Icicle (Rune)s from this level on, which is easier to sell and has an higher price.
Before the Major Game Update 8.1 it used to have less charges (only 5) but also less mana to make (just 280), also the magic level to use was 4. The magical formula was adori gran but has since changed to adori vis to better match the new element system.