One thing worth saying to anybody weighing this up who is new to CPAP data: you do not need the deep-analysis engines to answer your first three months of questions. Usage, AHI, leak and pressure — the numbers that a clinic actually reviews — are all on the cheaper tier. The engines earn their keep for the specific case of "my numbers look fine and I still feel terrible", which is a real and common case, but it is not where anybody starts.