These do work
The select flow tends to clog on very thick liquids like milkshakes and of course, there's nothing you can do when the patient takes the straw off the side (the clips are somewhat flimsy) and drinks right out of the glass because they are unhappy with the flow rate. :((  However, for many slightly, thickened liquids it does reduce the flow to the point where someone who tends to drinks too fast or gulp liquids simply has to slow down. And so far, that is enough to keep my Dad from aspirating as often or as much. The funnel at the end of the straw does tend to find its way into the disposer if you're not careful, so I'm sure I'll be replacing them at some point but so far they do what they are designed to do.
Rating: 4 stars