Reasonably satisfied with the loader. One suggested improvement is making the cutouts for AR-15 mags fit a little tighter so the mags don't move around when you're attempting to load them. Another improvement is in the instructions - attempting to load 30 rounds in an AR15 mag simply won't happen with any regularity. But if you load 10 round at a time, they seem to load ok. If I can figure a way to tighten up how the empty mag fits in the loader, then it'd be better. Between this and an UPLU...