I am a contractor and specialize in post frame buildings. I use cordless drills to install all woodgrip screws on buildings that have metal siding. I have used Makita brand cordless drills in the past and have had nothing but problems. In a prodution environment they can not handle the job. Their thermo saftey device goes off all the time and their batteries wont even come close to charging unless cooled for a long period of time. I am now using 14.4 volt ryobi and have had great results so far. The ryobi doesnt even come close to reaching the temperature that my old makitas did.