If someone is advertising a specific model Weishi, one would assume they know that it's a genuine Weishi. I don't believe the other Chinese companies making TTO's are knocking off Weishi's, but are just producing TTO's that are similar in appearance if they are based on the original Gillette patent design. Keep in mind the Weishi itself is based on, and basically a knock off of the Gillette Superspeed patent. I don't know that the 9306 series has any bad ones, depending upon each individuals perception and preference. I have read some posts online that the 9306-H that comes in the blister pack does not shave as well as the other 9306's. Other than that, I believe the difference in the various models is merely the finish, handle length, and the aluminum handle vs the copper alloy handle. A place I consider good for reviews is Amazon. These are people who have actually purchased and used the product & the review indicates whether the reviewer is a verified purchaser.