I have these in a 0g as well and liked them so much I wanted them in the larger size when I stretched up.  They are pretty and fit nicely and are very comfortable.

The only problem I have with them is screwing them on/together, I ALWAYS get the back piece crooked and have to redo it a few times before they are screwed together right.  I've had other screw on tunnels that, once screwed together, wouldn't come apart to take them out, but with these I don't seem to be able to over tighten them, which is a good thing to me and yet I've never lost the back or had them come apart because they weren't overtightened.  They're not too heavy either, in fact, once I've got them in, I hardly notice them at all.

I've gotten numerous compliments on them, too, and with repeated wearings I haven't lost a single CZ yet.