i forgot, you should consider how the casing will hold up when you drop it off a 6 foot ladder. Especially a heavier cordless type. Most of the cheap corded generic stuff sometimes have similar components as expensive brands. Cordless drills need more scrutiny for battery life and casing. I put a beads of silicone on my cordless drill to absorb shock to the drill and hardwood floors in case of a fall. This silicone trick helps to keep the drill from sliding off an angled roof when working up higher.