Get the 30ml bottles then. Those would get you far enough along in knowing if you like them or not.That's what I was thinking but then again with the strawberry and the vanilla bean ice cream I was wondering if 15 mL would make very much at all?
Also some people get a peppery taste from the TFA vanilla bean ice cream even after a long steep. Another reason to go with either 15 or 30ml bottles. At least until you know if you like it or not.
And just cause a flavor is popular with many folks does not mean you will like it. That's true of all flavors and flavor brands.