I just had to write based on my initial contact. I need a oxygen concentrator rental when I travel and sometimes arrangements can be very trying and most expensive! I just talked with a Rhondala (not sure of spelling) and was pleasantly surprised with the ease of getting informatioon. I certainly will call back and rent the concentrator and will try to remember to follow up on their service after the sale. Very knowledgeable and polite person is reason I will rent through this business!