I have heard countless stories of people contacting the manufacturer for help with problems and being hung up on. Overall it is a lot of cheap fun if you get one that works with your gun but is one of those things where you pays your money and takes your chances.
Frankly, if the internet had been accessable when I bought my Ciener conversion kit so I could hear other people's experiences with Ciener, I would never have bought it. As it is, I won't buy another Ciener product.