Yep, everyone is right. It is subjective to taste. I've been playing around with these flavors for about a month now. I like the various berry flavors. I started out with 2 drops and added 1 drop at a time after testing. I found that the actual flavor will depend on how many drops to use. Some flavors are stronger than others, so it is a testing game. Very important - keep notes! I have an index card for each flavor. I also had to order some sweetener (from MsTsBakery) to fine-tune some of the more bitter flavors. But, hey, some folks like it tart - so we come back around to the subjective part.
Have fun with it and have patience!