I bought this to load a high capacity .40 magazine that after 5 rounds is almost impossible to fill by hand. There was a bit of a shipping issue that was quickly resolved with an email to customer service. Once I received the package I removed the loader and immediately filled the magazine. Admittedly I had to figure out how it worked but once I got going it worked fine. The mag was fully loaded and my thumbs were still usable. Well worth the price.