When choosing a diamond product you must first decide how often the product is to be used and the longevity of life expected. If you are a large civil engineer for instance, you will undoubtedly need a product that is to be used on a regular daily basis and that will give long life and a fast cutting speed. On the other hand, if you are a general builder who only occasionally uses a diamond blade you will need to use a product that will adequately do the job, but not necessarily with the same level of performance.
A specialist quality product will actually be less expensive per cut/metre in the long run than say a Trade blade. Since the Specialist product may cut 10 times more than the Trade blade but cost only three times as much. Large companies will consider the price per cut or per metre more important than the initial unit purchase price of the product.