Artik, if you fly your Yak3 into 3 Brews you can pretty much toy with them and BnZ them till they crash due to dizziness. However, replace one of them with a capable plane like a 109K and the Brews become a worry. The 109 can force you into an E-bleeding fight and the Brews will be all over you. They are dangerous only as a secondary threat, but when they are, they are very dangerous.