Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poorly Built

Bought this filter for a very small price, with very low expectations. Even in such a case this filter fails to meet expectations. The build quality is abysmal, while I was attaching the filter to my lens the glass just fell off! I put the filter back together, but after a little use it falls right off again.For the effectiveness: it will give you a bad flare if you have a light source in the frame or right out of its border. The polarizing effect is not that bad (given that you have low expectation to start with).IMHO, it is not worth the price paid, however small; you are better off using a UV filter for protection and post processing for the sky color etc..