Yes I know what they do.

100+200(1-%progress)

The issue is this:

For 1 use of Name of [element]: It costs 21CP for 300% efficiency. Notably it also sucks a ton because it costs you the opportunity to use the 54GSM skill or the 54CUL skill both of which provide very strong openers at a fraction of the cost. The GSM one is arguably a superior cross class skill even if the CP costs were the same. As a 1move finisher, it's also somewhat unreliable because it gives you a 10% chance to fail your craft if used on the last step. Most people are not looking for a 90% craft finisher when they can likely just HQ it without this skill.


For 2 uses of Name of [element]: It's very likely that SHII + RS*2 will give you the same progress with 10% less success rate but for the equivalent of 17CP less. If we compare the cost of of the CP/dur with manipulation/masters mend we can say that 10DUR is worth ~30CP. Since it's only a 10% chance to fail more, it's worth approximately 3CP for that 10 difference yet the craft is charging you 8.5CP more per use of brand.

For 3 uses of Name of [element]: It's just plain worse than SHII +RS*3.

It's also not even good as a pure opener because the GSM one at the moment seems to edge out all competition.