I like Zyra's changes!
I just tried her out in jungle (she's one of my favs) and it was so easy to clear camps. She takes no damage once she gets one point in her W because they tank well and the CDR on W so much lower with her changes. I just played a game with her, (got cheesed early and couldn't catch up) but even behind I felt impactful because of Zyra's utility. We might have been slaughtered in that game due mostly to my inexperience in jungle (and a feeding bot that was 0/8 at 10 mins) but it felt really fun. If I can have fun while losing then I know its a good thing. Good job riot!
I've also had a game with her as support and she works great there too. I think you guys finally found a way to put her in jungle and support. Haven't tried mid lane (which I know a lot of people want) with her yet but I always felt that thematically she belonged in jungle anyway. I suspect her mid laning is healthier too! If anything I worry that she will be nerfed because she does well in multiple positions and historically Riot doesn't allow that to happen. For now it seems like Riot is cool with this and I really like that. Zyra certainly has some defined weaknesses and is not a fit all but you can always feel like you make a difference in each of the roles that she can fill.