Tbh i havent come across terrible customer service from Resmed, although the NHS contact number for Resmed isnt great in terms of CS. Their products tend to be decent quality and work well, eventhough they are very expensive. Theyre always out of sgock, especially if your an NHS patient. But i have one major problem with one of their products.

I have the Air Fit F20 Full Face Mask and the Climate Line Air, and the connection between both is terribly designed (it disconnects almost every night). The mask has a smooth short solid tube, and the tube has a loose rubber tube. Whoever came up with that design needs to be fired man. After all that money spent i wouldve expected something with a lot better and functional design (it makes all the rest of the money ive spent a waste). If i could post a picture of the connection i wouldve.