Its a cheese factory out there in bronze. I just played my first online match with Zerg after only a few games against AI. Tried a Terran bunker rush and the funny part was I watched the replay and his SCV ran right under my overlord going into my base and I didn't notice. Then he tried to setup a factory outside of my base and tank rush me. Check it out.
http://www.sc2replayed.com/replays/6...elnaga-caverns
Edit: Probably would have work if he didn't screw up and build an engineering bay instead of a rax first, lol.