I read the reviews for this and wasn't sure about it.
I saw some people appear to have burns or sores. Well after having used this several times now I can tell you... yes, you could possibly get sores if misuse it.
these are rotating fingers under the fabric so if you put this directly on your skin without a piece of clothing between you and it, you may get sores from the fabric rubbing on your skin.
I did not have this problem.
The cord however is an issue. it does come disconnected easily and often. I love this product so much that I just chose to wrap some electrical tape around the connection and solve that problem.
The first night I used this, I found I had some aches and tenderness the next day. This is expected. You are manipulating muscles...just as if you went to a physical therapist. You are going to be sore.
The second day, however, much better.
Don't be quick to judge this product. use it several times and give it a fair chance to get you over the hump. You will feel worse before better but... you will feel better!
I am thinking about purchasing several more as gifts for Christmas. This is by far the best product I purchased this year.