When I purchased my first set of Lipos I purchased Duratrax 2s 4000 mAh and they worked great for my son's Rustler.

http://www3.towerhobbies.com/cgi-bin...&I=LXBPGX&P=ML

When I wanted extended run-times for my Slash 4x4, I purchased Duratrax 2s 8000 mAh and it worked fantastic for me.

http://www3.towerhobbies.com/cgi-bin...&I=LXBPHA&P=ML

I now run Duratrax 2s 5000 mAh in my ERBE and it works amazingly well...

http://www3.towerhobbies.com/cgi-bin...&I=LXBDBH&P=ML

Just wondering why I never see anyone ever talking about that brand of Lipos on the boards here?