I too have bought one of these from Ebay, from China, and seeing as they are probably made in that area anyway I thought I would give it a go.
Well one year on and it's still going well, battery charges and works like original (even if it isn't). So go for it what have you got to loose, certainly not the £40 odd pounds minimum price they want here in the UK. Rip off Britain! comes to mind.
Yes mine had original catalogue and ref number too, absoloutley identical in every way including; It works as the original does
Alpha 300 , Sony 18-70mm kit lens & Tamron 70-00mm
The Camera never lies, but the software does.