I have bought and received and tested 8 of these lights http://www.ebay.com/sch/m.html?_odkw=&_ssn=ordinaryworld2009&hash=item48...
for between 99c and $1.55 from dates 26 Nov to 25 Dec 2016 and now that my purchasing is done can heartily recommend them as great value for money.
Although they don’t have actual q5 LEDs like my 3 or 4 year old sk68 clones, the LEDs they do have are almost as bright, last much longer and don’t heat up as much (which indicates reasonable efficiency to me). 5 of the 8 I have tested have a colder/harsher light than my old lights but 3 have almost the same warmth as the old ones (for some reason the warmer ones last longer.)
The SK68 clone I bought from zeusmall on the 28th Nov was a piece of junk and has already been binned. The light was very weak and the flashlight was terribly designed so the lens couldn’t go all the way back leaving a tight beam at full flood.
Personally I take the lens off my SK68s for use in the house and have a magnificent almost hemisphere of light to work with.