I ordered a IGO-M from them and I'm very unsure if it is an actual authentic or not but who knows that might just very well be the quality of IGO products. Guess it's not a fair comparison to something like my Zenith...
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Check your order, if it says genuine it will be. That I know they don't sell any Youde Igos, so it's probably a clone / copy. I got an Igo-L way back when - it's still going strong.
But to be fair the point is that some of the items from fasttech are of questionable quality. The best thing to do is read the reviews on their own forums. Also, when looking at an item, check the drop-down box on the right hand side. You might find multiple listings due to different suppliers of the product. Go through each of them and again, check the reviews and forum posts.
I think buying from fasttech is almost like a dark art...