And while the Flex hammer drill is a bit on the bulky side, its ergonomic handle and balanced weight add comfort during use. Of course, a cordless drill isn’t just about using huge drill bits and boring into harder materials. While the weight difference is certainly noticeable, the Flex hammer drill is very well-balanced, which helps make that weight easier to control. Along with being a bit heavy, the Flex hammer drill is also a little on the bulky side when compared to other premium hammer drills. Final ThoughtsWith impressive speed and torque, the Flex hammer drill is the best performing cordless hammer drill I’ve tested.