Not my pic but it's the pic of the one I ordered and RECEIVED!! just this Monday:
I like my 30mm magma because it's so BIG; good for my 50+ year old eyes and nolongersteady fingers; the two posts are widely separated instead of having a center post;
by contrast the igo-w3 was a pain to build with 5 posts cluttered in a 22mm well;
the magma top cap screws on, so I guess that's a plus because there's no rubber rings to wear out; so this thing can last forever provided by the looks of it; the airflow ring doesn't turn once I screw down the top cap, in a way it's a minus but in a way it's a plus. And it's got adjustable center pin, unlike my igo-w3.
I also got a veritas from fasttech, but 1 night soak and the water was brown from rust - apparently from the screws and nuts. Plus it's a pain to take the topcap off; you gotta screw it onto a mod to do that.