Battle mage guide

Main qualm about hashing up a 4th job build for my Battlemage is Cyclone. I have no idea what it's like, how it acts or how useful it is as a skill. Is it a good 1 pointer skill or does it need a decent amount of SP to become a worthy addition to training/bossing? Dependant on how useful it is, is it decent enough to consider maxing early (in levels 120-150) or can it be left until later on?

I only ask because alot of the builds (except the one in the OP) seem to be focusing on optimising the 6blow/ADA/stance attack pattern first.

Am fully aware all builds are highly subject to mastery book availability as of current. :<

I think it depends on your playing style. Personally I won't touch stance for quite some times as I use Adv Dark Chain to stun and pull monsters. Stance would be useful if you go bossing a lot. I found it to be effective at around lvl 25 (80%.
I have lvl 1 Cyclone. It is enough for me to clear all Gigantic Vikings at the bottom of the map so it is a good 1 pointer skill. ADA and FB are the main skills to max. I plan to save my SPs if I can't find the mastery books.