I just went to check our new 3/16 setup today - 21 taps were overflowing my 55 gallon drum far before I would have ever expected. This is really amazing stuff and we will surely use a lot more next year.
We posted a handful of photos on our facebook page including our maxed out vacuum gauge and a few descriptions.
My next thought is that this method, combined with a battery-operated diaphragm pump is the best of both worlds for remote locations using 20-100 taps - use the battery-driven pump to get the flow started in slow periods, and then let natural vacuum keep it rolling and preserve the battery.