I am rather a slim person with good skin but some sagging.
I was quite excited about this device as it sounds perfect for me.
I used a device as directed for jut over 5 weeks on thighs and upper arms.
Firstly I noticed that on some places current sort of hits the nerve and gives give a little shock.
Also, overall sensation after using the device is not very pleasant and tends to last.
Lastly, I have a small spider vain on one of my legs and this turned redder and more pronounced.
I consulted a physiotherapist and his advice was to discontinue use and suggested that as I am very slim there is not enough fat to protect nerve endings.
This is rather disappointing as skinny people are most likely to suffer increased sagging.
Apart from that, this device is well designed and easy to use and the battery last for weeks.
The only other objection is the cost of gel: around £40 per bottle that lasts about a week for legs and arms.
I do hope it is possible to refund the device as it is quite expensive and it takes some time to test.