I tested stuff with Ashe

I tested stuff with her. Here's what I found:

1. Elixir of sorcery is on-hit, not on-attack, so you cannot insta-gib towers with 125 true damage per Q-charged attack at 2.5 attack speed. It would be fun for they day until she got patched, though, wouldn't it?
2. Statikk Shiv charge-up, which I thought was an on-attack effect, only charges once per volley. So no proc'ing it every 2nd attack when under full-stack Q.
3. CDR is really important on her. You want 40% so your Q is almost always available. It is both a damage and an attack speed steroid.
4. To that effect, I highly recommend black cleaver on her. She will full-stack her target instantly.
5. Runaan's Hurricane looks really cool, but it does crap damage because the side arrows cannot proc crit effects, so your passive is wasted. The one exception is that you can insta-stack black cleaver on the entire enemy team. I'm not sure it's worth it, though, since you will be able to basically instant-stack cleaver on your main target as soon as you switch.
6. You cannot bring her crit chance damage over 100%. It is capped at 100 crit chance. (edit: I mean if your crit chance is 130%, you stop benefiting at 100% and waste 30% stats worth of gold)
7. ALWAYS open with W. You want your targets slowed before you start hitting them.
8. She sucks at dragon/baron because he cannot get frosted, so all the gold you spend on crit is completely wasted for those two objectives. She can, however, still stack her frost stacks, so she can proc a 40% AS/35% damage steroid on them on-cooldown (I re-tested this and was mistaken -- even though dragon did not show the debuff, it was still getting increased damage)

Some of this stuff might be obvious to some people, but it was helpful to me to test it, so I thought I'd share my findings.