I bought one of these to evaluate a few months ago, at the time they were about £14 including shipping, so not a lot to risk. Yes, they are almost a direct copy of the Lee "Perfect" measure and work just as well. If you are looking for a cheap measure and not thinking of charging high volumes of large cases then this will do the job well. Of course for £20 or so you will not get a Harrell which sell at around ten times the price, but there again there won't be much, if any, difference in the accuracy.
A measure is a measure, powder flows into a cavity when you turn the handle and flows out again when you turn the handle the other way - simples!
Personally I never load straight from the measure, I always trickle up to exact weight with a beam scale so any measure that that I can set to throw about a grain light will do the job.
Laurie Holland recently reviewed a range of Powder Measures, from the lowly Lee to the Rolls-Royce Harrell. Any one who has read any of Lauries articles will know just how painstakingly accurate his measurements are. Guess which measure beat all the Lyman, Redding, Bananza etc. measures for accuracy - Yes, the cheap little Lee at less than £30.
http://www.scribd.com/doc/49879348/Target-Shooter-March-2011
There are a couple of things to consider with the Chinese copy (and the Lee) the powder capacity is not very large so If you are dropping 50gns or so at a time straight from the measure and in a rush keep an eye on the powder level. The Chinese copy does not have a handle, it has a knurled wheel - I couldn't get on with this so made a handle.
If you are on a tight budget and you can get this delivered for less than £20 it will do the job well - If you can pick up a Lee without delivery charges for £27 I would probably go for the Lee - Both work well and will just as accurate as the Redding Competition BR-30 at around £300 - I can hear you all laughing now.