Poll the audience! Vayne: max out AS or build standard?

Sure, Vayne has the 3-hit %MaxHealthTrueDamage, but is it worth making Attack Speed your main priority over sticking to the holy trinity of auto attacks? (AD, AS, and crit, balanced, since the latter two multiply the former) Are there any other things to consider, such as building more AD to maximize the burst from her Q's, or to play a more hit and run style with her Q stealth?