clean eaters--opinions on Stevia?

I use Stevia now to sweeten my tea. But for baking I either use agave nectar or organic pure cane sugar. Stevia is all natural and nothing artificial about it, so I say as with anything it's ok in moderation.

I did a bit of reasearch as I read a few American blogs where they use stevia but it's not available or legal in the UK so I wanted to know a bit more and as far as I've read it's all natural and no negative effects have been proven - there have been studies that have tried but they have been flawed and disproved too many times.
The brand I use is all natural and I find it OK, only need a tiny amount. Much prefer to use agave nectar, honey or fruit to sweeten things though.

I would never use Stevia. It has chemicals like the others (to remove its bitterness). Stevia comes from a plant that can exhibits some birth control effects (google). My doc thinks it has some estrogenic effect so no thanks.

some brands might add chemicals (but it's easy to check) they don't need to use chemicals to extract the bitterness, it seems to be commonly done by heating and filtering, but not adding chemicals. you can do it yourself at home with some pure alcohol, heat and filtering (alcohol is evaporated with the heat)

the product sold in the US in grocery stores is chemically alterered. You can buy it in health food stores as a liquid and it is not.

Still a big no no for me. THe potential estrogenic effects are a negative.