I have trouble when it comes to making breastfeeding seem problematic for mothers. Common sense tells us that if we are going to drink, we shouldn't do so in excess, and certainly shouldn't push the limits when caring for young babies and children, nursing or not. I think this product encourages moms to do just that. If a mother drinks enough to feel really tipsy, she shouldn't be handling an infant, and definitely not sleeping with one.
On average, it takes an adult about 1 1/2 - 2 hours per ounce to metabolize the alcohol. This of course varies with weight, food intake. She need not pump and dump her milk because of alcohol (unless she was extremely engorged and overindulged causing a much greater interval before metabolizing the alcohol - a situation that would not occur in an "occasional glass of wine/margarita/beer" scenario. Pumping will not hasten the reduction in blood alcohol level, nor the milk either.
Rather than feeling she must do a science experiment to assess her (inferred) "toxic" milk, she simply needs to time her intake of the drink and the next feeding appropriately, to occur after she has metabolized the drink. Alcohol is not, I repeat NOT stored in human milk. When mother's blood alcohol level drops to normal, her milk is normal also.
Do we need a glass of wine? No. I don't need chocolate cake either, but every now and then I like to splurge. If you have a healthy term baby, an occasional drink, timed appropriately without getting unduly stressed and high tech, is not going to have lasting implications for either you or your baby. You can have your cake, and eat it too!