is Quinn worth buying?

ive been saving up IP and i have about 7800 and i was gonna wait to get illaoi but id rather just buy someone now. i am thinking about quinn. I see alot of stuff about how she is nerfed and sucks then people saying she is op and snowballs like crazy which i witnessed yesterday when i was leblanc mid and she was top against rumble. she only built maw of malmoritus and some boots and snowballed very hard after getting a kill or two. I underestimated how fast she goes lane to lane aswell. shed push me under tower and then shed be gone into the darkness. then as soon as id come out into the lane shed be back in a instant and id have to run back under the tower XD So is it worth it? and please people who have actually played her comment. And the new her not the old one. For ADC i main i also play ashe and sivir and tristana but draven is just my favorite champion overall in league. So is quinn worth buying? tips on her and potential builds?