Actually, with glass droppers, it is far more accurate than syringes, other than fully calibrated glass syringes (upward of $150+ ea). That being said, I make basic flavorings in no less than 100 ml at a time, just so to avoid accuracy issues as much as possible, and use probably five different syringes of various sizes to try to be accurate. That being said, I only use the 100 drop method to TASTE TEST juices. It works extremely well for me, providing about 2.5 ml or so per batch that I can then fully
vape to find the flavor. Pretty hard to do with 5 drops on a dripper, one time, for example. Also, the beauty of the 100 drop method is that each drop equals 1%, which improves accuracy in the mix, without having to make 10 ml's or more, using only syringes. I am neither critical, nor a proponent for any particular method, but I do know what works best for me, and I make
juice just about every day of my life these days, creating at least five new flavors every single week, so I have some experience at this. I have tried many, many methods and only know what works, or doesn't work, for me. Also, please remember that TASTE TESTING is not so much about complete accuracy, as it is about the right ingredients in their approximate amounts/ratios. The only way is by testing, over and over again, and the 100 drop method is quick and accurate for this.
Another point about glass droppers (I use the 4" ones), is that they can be used over and over again, and I just go through the plastic ones too quick. I can easily blow through a hundred, or more, per day. The plastic ones never really clean up well, for me. One thing that is important to remember is that using the 100 drop method allows us to generate a recipe based on percentage, and not on drops. The difference is important, as every dropper varies by the number of drops per milliliter, and the variance is huge at 18 - 38 drops per ml. The 100 drop method eliminates that problem. Also, unless you're measuring by weight, how can you be 100% sure that 30 drops, for example, equals EXACTLY one ml, for example? Really no way, so there can be big problems with the drop method, other than the 100 drop method. Anyway, works well for me.