Customers say this funnel is handy and convenient for pouring powder into water bottles without spilling. Many appreciate its portability and compact design with lids, making it easy to carry supplements on the go. Users find it helpful for keeping counters clean and reducing mess. Some note the narrow opening can get clogged with fine powder and requires tapping to dispense. A few mention the lid doesn't thread securely. Overall, most find it practical for mixing drinks quickly, though some question its necessity given the included scoop.