Kettlebells will lead to greater fat loss
 
Kettlebells increase your metabolism by creating dense muscle mass. The fat loss power of kettlebells is explained by the extremely high metabolic cost of throwing the weight around combined with the fat burning effect of the growth hormone stimulated by such exercises.
 
Kettlebells deliver unparalleled cardio benefits.

With kettlebell workouts, two different actions must work together: resistance and overall body movement. The ballistic nature of kettlebell lifting creates a challenge for the muscles that cardio workout alone does not do.
 
Kettlebells are different from dumbbells and barbells
 
Kettlebells do not require a special facility. They are nearly indestructible and relatively inexpensive. Furthermore they deliver faster results than any other type of workout.
The center of gravity is distally placed, thereby creating greater forces of inertia.

In order to control the weight you must employ the use of the stabilizing muscles. Isolation exercises such as those done with dumbbells and barbells do not hit those stabilizing muscles to the same degree. Isolation exercises train only the major muscle groups.
 
Kettlebells rehabilitate and prevent future injury

Soviet research shows that the intense grip required to swing (and hold) the kettlebell along with the dynamic movement helps to prevent and/or reduce all types of arthritis. The acceleration/deceleration of moving the kettlebell strengthens the connective tissues (tendons, ligaments, cartilage) and increases shoulder mobility, strength and flexibility reducing the possibility of injury.

Kettlebells will make your back strong and resilient by conditioning your back statically and dynamically. Many Russians have successfully rehabilitated hopeless back injuries with kettlebells.
 
Kettlebells are great for general conditioning.

Kettlebell training mimics natural human movement thereby making everyday activities easier and injury less likely. Kettlebell training offers the most functional training possible, because the parts of the body must work as a unit.

Every lift with the kettlebell engages the entire body. The kettlebell movement is never a single joint movement. Every swing, lift, press engages each joint and muscle group forcing the body to always work as a unified whole. Kettlebells were the conditioning tool of choice for all athletes in the Soviet Union.
 
Kettlebells increase mental focus
 
The task associated with kettlebells is a complex requiring precise body movements which must be performed sequentially. At each moment the lifter must be focused on the movement. The result is improved coordination and mental focus.