My BIL has a similar sleep apnea machine that he has been using for the past year plus and he loves it! He feels more rested than he has in his adult life AND his wife has never slept better since they married!
I'm wishing DH would get one too. I'm a light sleeper to begin with and DH's snoring has made me a non-sleeper most of the time.
Good luck to you and great news for your DW.