In this case you get what you pay for. They are very high quality and you can tell it when you hold it look at it and shoot it.
My mags for my Tactical Solutions 22 1911 conversion run 50 to 70 a pop for 10 round mags. However they're milled out of aluminum and have a slide stop feature unlike most any other "cheaper" mags out there including blackdog.
In the few seconds it takes you too drop and insert another mag I can fire my remaining 25 rounds and be off to reloading again myself. More lead down range. Necessary? Nope...but awesome nonetheless.
So in those two seconds, you have loaded maybe 4 bullets. If I bought 4 25 rounders for less than 80, I could have squeezed off 100 rounds to your 50 minus the 16 bullets you reloaded inbetween each mag drop. Just not addin up to me, like I said if this were a 100 rounder(which doesnt seem all that hard to make) I would be all over this but $80 is just too much IMO.