The Triple-K (unfortunate name) 10-round magazines are pretty decent, though I've found that they typically require a feed lip tweak to achieve the correct presentation angle for reliable feeding. They do stick out quite far and I can understand how someone may dislike that.
The really cheap 10-round magazines (identified by the round hole on each side of the magazine body) are trash. I bought two, neither functioned, I suspect I threw the things out. Avoid them and save your money.
