Compliance rates of CPAP use in general are remarkably good and match the compliance rates for medications for chronic conditions. In an interesting way, the use of compliance monitoring on CPAP systems has given the clinician a very effective tool that is not available, for example for use of antihypertensive drugs. However, there is robust evidence that the best compliance only occurs if the introduction of the patient to CPAP is done with well trained experts, and if the patient is closely followed and supported by those people. Within the noise around the various debates on ambulatory at-home versus full in laboratory PSG, this point is often missed. What matters is that experienced people manage the patient at the beginning, and then compliance can be excellent.
There is little point in having some untrained franchise doing a portable diagnostic study and simply putting someone on CPAP using some simple protocol. Unless those people know what they are doing and support and care for the patient in the first few months, long-term compliance will be poor.