Quote Originally Posted by Odiato View Post
What do you guys think about the skill Impulsive Drive from the lancer? It deals 180 when behind the target.
A seemingly knowledgeable PUG wrote this: http://ffxivrealm.com/guides/monk-dps-guide-v2.14/

In it, he states:

Impulse Drive 70 TP (Lancer Level 8 )
Delivers an attack with a potency of 100. 180 when delivered from behind target.

Could be used if you cannot do your rotation for some reason and if you can go behind target. But overall it is not worth the global cooldown, since your rotation all in all deals more damage.
But the main reason, why it is bad to use is not the lack in damage (which will not be true any longer if you have enough crit and haste) but the high TP amount.