When purchasing off the dw generally you'll be buying presses or blister packs.
Presses are "homemade" by someone so you never really know what you're buying, that's why they tend to be cheaper.
Blisters are in most cases proper pharma grade that the marketplace holder has sourced from somewhere. No one is pressing their own pills and going to the trouble to put them into blister packs to pass them off as more legit.
To answer your question, I don't find zopiclone does much for me, I developed tolerance really quick and was taking 3-4 a night and still not sleeping. I've thankfully kicked that habit (cold turkey, that was not fun). Some people do swear by zopiclone though.