I bought this product about 2 years ago and I have been using it since. In general it performs well. Without it my Humax 9200 pvr cannot find any channels but after installation it can find everything and most channels are perfectly clear. It isn't perfect though; it seems very flimsy and I always found that moving it around varied the quality of the signal for no obvious reason. Whilst it has a variable signal the dial (turned by a screwdriver) will keep turning through 360 degrees and it is a matter of trial and error to achieve the desired output. I also had to wire on a plug to the power cable as one was not included in the box.
I did buy this more than two years ago so whether it still has these problems I don't know. This product offers a high level of gain and outputs for the price, but from my experience build quality and reliability could be better.