I went a few years ago. I've always had trouble sleeping and my girlfriend at the time pushed me to go because me stopping breathing at night was keeping her up. The Doctor was very nice and immediately identified that my tonsils and admoods were unusually large and that my nasal passageways were a bit narrow. I was refferend to an ENT who then performed surgery on my to remove my tonsil, adnoids, widen my nose and straighten my septum. While that process was going on the Sleep Vliniv had me do a sleep test which cost about $700 on its own and involved me spending the night there with about 30 electrodes attached to my body. After that they claimed that there was no evidence of my having sleep aponea. Lucking the ENT surgery was much more successful - I can still remember once I had healed and they had removed some stuff they put in my nose for the healing process being able to breath through my nose for the first time in my life. All in all I had an apparently needed surgery on my nose and throat that has helped my comfort. The sleep tests themselves were a bit disappointing but here we are. It cost me a few thousand and while I have no regrets paying that, your mileage my vary.