Looks like xPAP will continue to be "gold standard" of treatment for OSA, for those who persevere and learn to tolerate it. And for central or mixed central-plus-obstructive sleep apnea there is no alternative to bi-level xPAP or ASV.
Regarding the very new Winx Therapy System (~US$1000, available only in USA, and not yet available in most States, and not yet covered by most insurance companies): in an early trial of 63 patients having Mild, Moderate or Severe OSA, about a third were successful BOTH in lowering their AHI by at least half AND in lowering their AHI to below 10. (Those who had only Mild OSA to start with had a fairly good chance of lowering their AHI to 5 or better.) The Winx system looks like it would be much easier to tolerate than xPAP (at least if one does not need to mouth-breath because of nasal constriction) but the clinical results are not really all that impressive yet. However, the article above does say Apnicure will be introducing an improved Winx system in 2014.
Link to Winx website: