I was recently diagnosed with severe OSA and I'm using a Resmed machine. I actually adapted to it immediately and I find the mask I'm using (Fisher and Paykel) to be comfortable.
Incredible life changer. You are fortunate that an appliance works, but I absolutely don't regret getting tested for it and using one.
I'm in my mid 30's and not obese, and didn't consider OSA to be likely but got tested due to grogginess and my Dad's recent diagnosis.