I have had mine for several years. You will get used to it. I am one of the odd people who had no problems getting used to it. I think the reason I didn't have any problems using it was because it was such a relief to have oxygon when I sleep. I have critical spnea and my oxygon levels go all the way down to the 50's without my machine.
When I was sleeping in a hospital bed I had to place it on the floor to keep from knocking it off of the nightstand. I had to replace the machine once because it fell and the water ruined the unit. Thank goodness they didn't make me pay for the replacement.