I used to main Sivir, I have around 400 games on her on my main account, and I am going to give this remake a chance, but I don't think this will put her on the level of Vayne/Kog/Cait.
Her W has been nerfed and her Ult has been nerfed. (Her W is ALOT stronger early-mid game, but late game its technically weaker since you won't get a bounce everytime you auto attack)
Her base attack speed and AD has been nerfed.
Her attack range is still one of the worst
She got a weaker version of vaynes passive.
Her Q's ability power ratio has been removed
On the bright side her Q now does physical damage. And her passive helps her chase.
I like the passive alot, I will stop getting kited. But I still have mixed feelings about this rework.