While I have only been a customer for about nine months, I find cpap.com to be a good seller of CPAP supplies. Their prices are decent, including much cheaper prices than my local Durable Medical Equipment supplier charges for masks and accessories (albeit through insurance). CPAP machine prices are more or less fixed by the manufacturer, so there is little in the way of discounting allowed. My orders of one mask and multiple supplies have always been promptly delivered by their regular delivery method, usually arriving within a few days. I have not had to return any items, so I cannot comment about that, but my interactions with their customer service via chat and email have been outstanding. My physician's office was slow to send my prescription to cpap.com, but cpap.com was quick to ask my permission to request it when no response was made to the first request. They regularly offer specials and free shipping offers if you sign up for their e-mailings, plus standing free shipping on minimum orders. They also maintain an active forum for CPAP users that I find very informative. Recommended.