Just awful customer service, after 4 days calling re cPap machine errors with return calls (still under warranty), no heat or humidity, finally called manufacturer ResMed & they said I had to deal with LINCARE since they sold it to me. After being persistent about not getting a response, they told me to report to my insurance company sonde ‘they’re paying big bucks for it’. Ins co got through to them & I got an appt in 4 days. ResMed also confirmed vendor is responsible for replacement since under warranty. From time I walked in for appt they kept saying I had to contact manufacturer, wouldn’t let me finish sentences, but did admit the airsense11 is having lots of problems with the heating function. After she tested machine & ‘checked’ with someone else gave me new machine. Seemed annoyed when I wanted to see settings she entered. Also asked about serial # & if connected to Bluetooth (since they did that when giving me 1st machine. She said I could do it! Said having no clue thought you do that, she said they’d do it ‘sometime today’! Looking for new vendor!