Yes, these are great magazines. It makes the 10/22 about 100X more fun - and they are pretty fun right out of the box with the ten rounder!
I have never had a problem with mine. Definatly extends the shooting fun time, but the reloading fun time is longer (obviously).
And is .22lr hard to find?? Dick's had tons of it and it was on sale on Sunday when I went. Case of .40 was also acquired on sale.