Keep in mind I have some strange tastes buds. To me cilantro tastes like soap, cumin tastes like dirty feet (not that I have tasted dirty feet, just going by the smell of them), milk and water out of plastic containers has a nasty bitter taste, and stevia has a bad metallic after taste.
As for the agave syrup the amber is very good, the darker syrup is also good but it has a very mild bitter after taste if you use in on pancakes or as a topping. When it is in a sauce or baked goods it is not noticeable.