I once ordered a 250GB HDD for my Xbox Slim a few years back for around $40-70 from Hong Kong (cheap price at the time for a slim HDD) and it worked great. Don't report it or think it's a scam until it arrives. I've gotten many cheap, working products from Hong Kong. My only bad experience was a $5 HDMI cable which didn't work and I got a complete refund for it (and got to keep the cable too!).
Also "Note:Speed may vary due to host hardware, software and usageThe actual available memory on the device is less than what is listed on the package." doesn't mean it's a scam. In general all storage manufacturers do this to make it appear there's more storage on the unit. When formatted it will probably show as around 55GB in Windows. I realize some of the feedback shouts "scammer, only receieved 8GB". Make sure when you get the device for yourself that you do get the storage you asked for. These chinese sellers do get things mixed up easily since they mass produce these in various sizes.