TGM units are very common here on the North Coast. Of all the Chinese brands, TGM is probably the best. They come in two different models. The best one has a "plastic" housing that won't rust but, more importantly, the compressor unit has a much improved condenser with special heavy duty alloy fins that will not be oxidezed as quickly by the salt air as the aluminum fins on the cheaper model.
It lasts almost twice as long as the regular model, but it costs almost twice as much. If you live on, or near, the beach, it's something you may definitely want to consider. You can buy a condenser coil spray for about 1000 pesos that will extend the life of both models. It must be applied before the condenser is installed.