I have the TFL Philips gained in October 2010 due to the many positive reviews and can the good Lechtkraft and easy installation only confirm. Unfortunately, after just 2 months moisture was in the spotlight. When I early March this year, the TFL have developed, I had to wonder but very on the quality of brackets and screws. Both heavily rusted! (I uploaded a picture!) Since you can expect more from a brand-name product. That with the moisture in the spotlight maybe can happen sometimes, I can not rule out that a rockfall caused a small crack. But one should the holders painting / coating that can withstand the moisture for many years already as good. Also contact with salt in winter should not be a problem.
The exchange at Philips worked without problems, after nearly 3 weeks I had the new kit. The new TFL will now light up diligently, and I'm going to the holders probably repaint yet, so my TFL does not fall in the winter nights due to the weggerosteten holders.