Here's a better look at the steel locking tab.
This gives you a better look at the texture of the magazine. Its aggressive enough without going overboard. When my hands get wet or sweaty, I sometimes have a problem with PMags slipping. It's not an issue with these mags.
A pic of the bottom. You can see that they have put in a drainage hole for those of you in wet environments. Just so everyone knows, they recommend putting a piece of electrical tape on the inside covering the hole if you live in a sandy environment. I live in Florida, parts of which are pretty sandy, and have had no issues. If you live in the desert, that might be a different story.
Overall, I have been very pleased with the one that I bought, and it has become my mag of choice. I will be selling the PMags and the Troy BattleMag that I bought, and buying another 19 or so of the L5 AWMs. At this point, they don't have any with windows, but they have models that are translucent. I believe they can be had in brown or smoke, but they are a little more costly. Somewhere around $28 ish IIRC.
I got mine from Midway USA for $15.25 each. Not quite as cheap as some other options, but worth the extra cost in my opinion. Here's the link:
If you decide to try some out, and I really encourage everyone to, make sure you buy the Lancer L5 Advanced Warfighter Magazine, and not the standard L5. The AWM is the one with the steel feed lips.