I have only had this item for a few days, and have only just gained the knack of shaking it properly, but I feel sure that, long term, it will work for me!
I can certainly feel my arms tensing when following Lynsey's instructions, and one of the exercises, for me, is a real killer!! I should say, that of all the different exercise DVD's I have tried, this lady is the least grating on me, and seems to be genuinely encouraging us to carry on!!
I cannot really add to many of the other reviews, but hope to update this once I have been using it for a suitable length of time.