Works well for its purpose
I use this only to trim my full beard and mustache, which is its stated function, and it does an excellent job.  It's very easy to adjust for the desired beard length, with no attachments to change, and unlike some reviewers I have never had a problem with it changing settings during use.  It catches 90-95% of the trimmed hairs, even without the "turbo" vacuum on more expensive models, and the trap is easy to empty.  It works quite well without the guard, although if you want to do very detailed trimming you might be better off with a trimmer designed for this.  It holds a charge for about 40 minutes of use, as advertised.  My only complaint is that, as others have noted, it cannot be used while plugged in, and when its charge runs down it dies rapidly.
Rating: 4 stars