Until what level is triple stab useful?

looks like you can skip triple stab altogether by starting at level 30 and you get 20 SPs for other skills ... from the skill tables it looks like triple stab is fairly good til you get upper stab at 70+, but I want to make sure on how to go about my build since I plan to make the DB my secondary.

Eh, if you have slash storm mastery book, I suppose you wouldn't need it, but I'm certainly glad I spent the points in it.

Also, when you think about it.

10-20 = 31sp
20-30 = 31sp
30-55 = 76sp

Thats 138 skill points. Now when we get useful skills
3 disorder
20 dark sight
10 double stab
19 mastery
10 triple stab
20 slash storm
20 fatal blow
20 self haste
16 booster

All skills are done, with booster missing but 4 points. Unless those 40 seconds will break you inside, get it anyway, what else would you use them on?

Endure for the always on passive mp =O

Going by the damage multipliers alone, Triple Stab outdamages everything on mobs of 3 or less until you get Flying Assaulter and/or Bloody Storm. Bloody Storm slightly outdamages Triple Stab, while Flying Assaulter outdamages Bloody Storm...

EDIT: Correction. Triple Stab outdamages everything on 3 targets. Between Triple Stab and Fatal Blow on 2 targets...I'll need someone to actually try it out. Fatal Blow definitely outdamages Triple Stab on 1 target. Flying Assaulter MUST be above Lv5 to outdamage Triple Stab on anything at all.

Imo. Triple Stab is infinitely more flexible than Slash Storm and Final Cut. The hit box is relatively big, attacks very fast and is plain powerful as it is. I see no reason to skip it. Plus, slash storm > triple stab combo is awesome. But eh, that's just my opinion.

I'm personally using SS as a teleport/mob luring attack until I somehow find the NX to buy the book. So far I haven't had any problems killing lured stuff fast with triple stab. I would say It's faster to kill with TS than with SS since SS haves a slight delay between attacks, combined with the fact that you might have to turn around and pass through the mobs another time to kill them. But then I don't know how powerful SS is when maxed so I'm just shooting in the dark here...