Things I liked: Aluminum construction which I feel is better than the OEM plastic magazine.
Things I would have changed: The the extra effort made on improving this over the original it would have been nice if they had numbered it so you could tell how many rounds are left.
What others should know: Not numbered but a better made magazine. It fits perfectly with no fuss. No timing issue and it uses an o-ring so the pellets drop right in and stop. The original required a special tool or a bit of fiddling. I still think 30.00 is a bit high but compared to other high end brands it is pretty reasonable. Works very smooth after it's used about 6-8 times. it may appear a little stiff at first so give it some time to wear in.