I purchased the body opponent bag to provide motivation and to compare its function to my old reliable heavy bag...BOB is terrific...however, whereas the heavybag is solidly hit when struck, BOB requires a little more finesse...the head gives easily and does not provide the resistance of a heavy bag...but this is good! Additionally, there is at least one DVD available which provides other methods of attack. I find I can practice choke outs on BOB. Overall, I would highly recommend BOB as a tool to add to your repertoire.