How about the quality of china diesel generator?

We all know that China is the largest producer of  generators in the world, and how about the quality of  china diesel generator? 
     The demand for electricity has been growing in the developing world. With the rising fuel prices especially for diesel, China diesel generator now have been  developed better fuel efficient to meet the international environmental standard, especially to the Europe standard and USA standard with the certificate CE and ISO. And nowadays china diesel generator always exported around the world.
About the brands of generator, many international famous brands such as Cummins, Perkins, Isuzu engine have been introduced and put into production . So it has received great praise in the market.