Great trimmer (but it died after a year)
Update a year later: I originally rated this trimmer at 5 stars (see review below). It died after a year and is not fixable so the rating is lowered to 2 stars.
I have been trimming my beard and mustache with scissors and a razor for many years and decided to try out a trimmer. I read the reviews of many trimmers and selected this one based on the decent reviews and low price ($10). I figured if I did not like it the cost of my education would be small.
I liked it from the start and after six weeks of use I still like it. It is indeed made of plastic but the plastic is high quality - the trimmer has a good feel and the removable guide is high quality and is finished well. I found a length I liked (#3) and the guide does not slip from that setting.
The guide is easily removable and I use it that way to trim the edge of my mustache. Once in a great while it will pull a bit before cutting.
The only negative is putting a drop of oil on the blade - not difficult, not annoying, just an extra 30 seconds when I am trying to get out the door in the morning. Almost all the other trimmers I checked out also require oiling so this appears to be part of the deal.
Uses batteries, light weight, one piece -- no wires, no charger, and no zillions of pieces. All in all, a five star product.