I bought this exact model of electric razor 6 months ago and it has been going strong since.
awesome price and awesome razor. replaced the Philips bought from this deal
just received an alert that it had dropped in price.
battery seems to last several weeks with daily shaves (admittedly my facial hair growth is insubstantial - i.e. I can not grow a beard - stupid asian genes)
the trim function thing is great for trimming sideburns, nape of neck etc.
for less than $20 - you're kicking goals.
I bought 2 of the Kemei brand electric toothbrushes 12 months ago (for my kids) and they are still going strong.