Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Just doesn't work!

I purchased one of these from eBay and it wouldn't work on either of my Canon cameras. The flash head itself, with the proper module works fine on my Minolta. I read the two Amazon reviews and went with J's comment that the first reviewer may have gotten a bad unit, that he had no problems, so I went ahead and ordered another one from Amazon. I've just spent an hour, reviewing manuals and camera settings and still end up with the same problem as the first one. Both Canons; Rebel EOS xt and EOS 20D are TTL functional and the product write up states that the module will work on both. I also use speedlights on both of these cameras, as well as my Nikon D3200 with no problems at all, so I know the hot shoe's and TTL's are working. I contacted the eBay seller and asked for suggestions and was told "don't know, I'm a Nikon man", end of story there. So, good luck getting it to work if you buy one, but I'm totally done with the project.