I don't feel much while doing upper body exercises with the straps - am I still getting a workout?

You can train the upper body while using the straps. For an effective work-out you will need to make sure that the straps are fully tightened at all times to enable a transfer of vibration to the upper body. Standing on the floor in front of the “WBV” Device while performing the exercises with the straps will allow you to experience more vibrations to the arms and upper body. For the extensors such as shoulders, chest and triceps you can also perform the exercises where direct contact with the plate is established.