Review (4/5): It totally DOES work, but it is totally A PAIN to use
First of all, a lot of people have said this is useless or that it doesn't work. That isn't remotely true. Versions of this device, in one form or another, have been on the market for like 50 years because they DO work. However, the device has an incredibly steep learning curve, is not intuitive to use, has multiple design problems, and costs way more than it should. One of the frustrating aspects of this device is that all of the probes/needles have a spring base. This is there to prevent an inexperienced user (read basically everyone who buys one of these) from accidentally applying current to a part of their skin other than a follicle and thereby potentially causing skin damage. This is an admirable idea, but in practice it means that unless you are 1,000% on-target with the probe, it will just just constantly bounce around on your skin without going into the follicle, truly a frustrating experience! The probes/needles are also far more expensive than professional electrolysis needles, likely due to the silly spring mechanism. I'll note that there are numerous guides for modifying this device (search Inverness OneTouch modifications if curious) to use pro needles which increases its utility and ease of use but also makes it potentially more dangerous if you don't know what you're doing.
Now for the good, this device gives you the ability to perform safe, effective, truly permanent hair removal on yourself and/or your loved ones in the comfort of your own home and at your own pace, accounting for your own comfort level. "Professional" electrologists are all over the place in terms of effectiveness, quality, value, actual, literal professionalism, etc. My experience with them has been uniformly poor despite patronizing nearly a dozen at this point. This is cheaper, more convenient, and, assuming you know what you're doing, more likely to be effective on a permanent basis than professional treatment, especially if the electrologist in question is not a 100% galvanic operator (this device is an unsophisticated example of a 100% galvanic machine). Just wish it were a little bit less frustrating to use!