If you are lucky enough to own an H&K MP5 or B&T in 9 mm you can now load your magazines with speed, directly out of the ammo box.
Simply mount the loader on the top of your magazine and slide the assembly over the rims of the 9×19 mm in the ammo box. Press the ammo into the magazine and start from the beginning. Repeat until full, and you’re ready to go back to your shooting in no time.
There is one version for the B&T product line (MP9/TP9, APC9, KH9 and P26) and one version for the HK 9×19 mm magazines.
Civilians might appreciate the time to talk to friends while loading, share the experience and getting some rest (i.e. get a healthier ammo per hour ratio).
But I can see an advantage for professionals during training, who wants to maximize shooting range downtime and instructor rent times. The 25 USD (estimated) it costs should be saved in an instant if that’s the case.