It depends where you live LOL! When we were in Homebush in NSW they were so bad we actually brought them with us to Melb. We had to throw out electrical appliances as they were living in them. We bombed we did everything it was DISGUSTING. But since being here in the SE subs the only roaches we get are the brown bush ones, and bombs do the trick. I swear to go NSW roaches are mutant. In WA they just it protein bars as they are huge, and here they are rather pathetic, although somewhat more alien like because they are the bush roaches.

ETA: German roaches... are they the small ones by any chance?! They were the ones we brought from sydney in our electrical appliances.