Exactly on the strpLLula. I was going to bring that up. If you are going to go to the range, and shoot more than say 300 rounds, and you only have 10 magazines; or less; then reloading can definitely be an issue. When I go to the range, I am usually shooting 3-4 different weapons. By primary carry hand gun; my choice of one of my other pistols; one of my .223; and for fun, either my 22LR rifle where I go on the metal silhouette portion of the range and have fun knocking over steel targets, or if it's close to hunting season, one of my hunting rifles.
So, the chance of me shooting more than 10 magazines (300 rounds) of .223 at one range trip, is pretty slim. Just shooting 300 rounds, and including the other guns, I'm probably going to be there about 3 hours anyway. This is one of the reasons however that I have at least 10 magazines loaded and with me at the range. So I don't have to reload. Mind you, I don't believe in the 30-40+ magazines that some people get into; but that's just me. I have 2-20's that I keep loaded at home for possible defense, and 1-10 loaded for when I help out on the ranch if I see a coyote, badger, prairie dog, etc... I basically keep 10-30's loaded for range time. I have a few more sitting around, but don't really load or use them.
I bought something similar to the Lula a couple years back. I was buying a lot of military surplus ammo on stripper clips. But in the last few years, most of my ammo is in box form. Last summer, my mom, sister, and brother came out to visit and attend my son's h.s. graduation. They love to shoot; and being from the communist state of New Jersey, they don't get to very often. So when they come to wyoming, we do a lot of shooting. Anyway; being I knew we would shoot a lot of .223, I loaded my normal 10 mags, but I also loaded up about 50 stripper clips with ammo. (Nothing better than sitting around the TV drinking beer and loading ammo). Anyway; I had about an extra 500 rounds on stripper clips. If we ran out of the 300 in magazines (We did), I used the Lula to speed load a few more magazines.
But generally speaking, I don't really have a need for needing fast reloads. I don't normally shoot more than 300 rounds at an outing. But this magazine definitely looks like it could come in handy. If you had 1 or 2 of these, they could be your back-up mags at the range if you did run out of loaded mags and still wanted to shoot some more. Definitely a cool idea. I definitely wouldn't have 10 of them however. Too expensive.