Hmm, never considered it. I should try sometime to see.

Well, generally, the way i play weaver is mostly support, unless i somehow get an extreme amount of kills, then i just play assassin style. At the beginning, i always get a few clarity pots, and spam my invis on them for a bit. Eventually, that won't be very effective so you'll have to mostly live with you're dual attack as the skill you'll be relying on most. Time Lapse is VERY useful, because it WILL get you out of sticky situations where you get spammed with dmg in 4 seconds, and then you'll be *Zwoot* and you're back at full hp. I think of it as getting to have twice the amount of hp, but i think differently, so yeah, don't take my word for it. And i usually farm for a bit, then get either Butterfly or Radiance.

But that's just how i play, i'm not actually very pro.