These guys have the best concentrates I've tried so far. I ordered peach, pink guava (which is SOOOO GOOD), strawberry and crunch cereal. They
threw in 15ml bottles of lemonade and yogurt as samples, which is just as large as the bottles I paid for. They go a LONG way @ 3-5%. I put 10 drops of the guava into a 30ml peach concoction that I didn't like (LorAnn and OOO mostly), and I love it now. It smells exactly like a grapefruit when you smell it, but it's not bitter like a grapefruit, it's sweet like candy!