Ya.. i own a couple jebo products, they dont come with instructions... What I did is found what product they try to mimic, go to the companies web site and look at their online insturctions.
for example jebo has a skimmer that mimics the cpr backpack, i went to cpr's website and found the insturctions... As for the quality of jebo's stuff, its just like the real brand except a lot easier on your pocket, their version of the bakpak is exactly the same except it comes with a different powerhead... so i went on ebay, bought a maxijet 1200 for 7$ and saved a S**t load 8O