I bought it and use it on my train track. It looks really good when it works. You can switch the boom stick out with a Lego in white (and put red / white tiles on, so it looks realistic.
However, it is not always the trains get the booms to automatically go up or down as they should, and sometimes I even get the booms to go up or down when I move past the field where the sensor is located, but I think it has something to do with the lighting conditions on my train track (direct sunlight and dark shadow). I haven't investigated the problem closer yet, so I believe it's a local problem and not a product problem. So based on my little experience a do recommend it.