Microcurrent machines

Hi
Just wanted views on microcurrent machines, the home versions like dermawand, rio, nuface etc. do they work ?? Don't really want to spend out money to find no good. I am not a trained beautician but am qualified in aromatherapy so wanted to add more to my facials in the future. For now wanted to try it out on myself before going into more training to add to my skills.
Thanks in advance. 🙂
Dormouse.