I have got one but, being female, i can't comment on how effective it is on male hair. Before anyone asks I use it on my legs.
I have found that it does work as advertised if you put the work in. That means very regular use and buffing off the burned hair with the pad supplied or with body scrub or whatever. You do get a strong smell of burned hair when you use it and you do have to get the knack of using it smoothly so that the electrode contacts the hairs. If you are starting out with long hair, shave first then allow a stubble to grow before using it.