Review (5/5): I've trimmed my beard for 25 years....
I've had a beard for over 25 years. I'd used Wahl products before... they're not terrible, but most trimmers leave a mess, particularly with thick coarse beards like mine.
1
This product has a "dial" for different height settings. I dial a 3 for my beard (which I keep close), and change to a 4 for my moustache. (Settings are 1-9, with 1 giving you a "1 day growth" look). This trimmer does a good job vacuuming the trimmings, and is easy to clean. There is a plastic door that opens to readily empty the vacuumed clippings.
There is a separate trim attachment for the sideburn or trim function... it doesn't take that long to change, but I could see where this might be an aggravation for a sideburn/goatee' kind of guy. My razor has a popout trimmer that I use for this purpose, so it isn't an issue for me.