I can't comment on that brand, but I bought Opteka lenses (wide & telephoto) off of eBay after Googling-up comments from other users. The comments were all positive (though none were from pros). I wanted them for my wife. I usually am the one who needs to change lenses, and I use Century brand, but for the price I figured that she may as well have some in her kit also.
I haven't done any serious testing, but we did use the wide angle lens for some informal shots and didn't notice any quality issues. I am certain though, that under more critical testing, some differences would appear between the cheap brands and the intermediate (Century Optics) brand.