If you're not 2x in spell aiming, you'll get a penalty to your CS when using the AIM verb with the spell.

CS penalty = 100 - trunc[ 100 * { SA ranks / (target level * 2 )}]

Spell aiming is pretty much a full 2x or none at all thing.

Up until I was in the mid to late 50's I got good use out of it, but eventually I stopped using any of the spells it affects enough to justify it and got rid of it in favor of more spell ranks.

Aside from 708, it also factors into the focused versions of 710 and 720. Focused 710 got me through the 20's and focused 720 is always a good "oh crap" spell to get you out of sticky situations... but 720 doesn't rely on SA enough to train in it just for that.

Starchitin, the OG

A severed gnomish hand crawls in on its fingertips and makes a rude gesture before quickly decaying and rotting into dust. A gust of wind quickly scatters the dust.

Currently (last I knew) targeted Limb Disrupt and focused 710 & 720 requires 1x in SA to be effective. 2x is certainly better, plus it allows you the versatility of using 713 and (if needs be) Fire Spirit. Still not as strong a bolter as a Wizard, but having them as a fallback option doesn't hurt if you're fighting something that has a higher TD than usual. I've found combining 709 and 713 handy when helping higher level players on bandit runs.

Sothog's player