Bests & Worsts Reviews from Amazon

In June 2012 I purchased an Inogen One oxygen concentrator from Inogen on the recommendation of my physician, Despite the fact that Inogen was told that the unit was to be used for home purposes (not travel), I was strongly advised to purchase a second battery at a cost of $495,00, which I regrettably did. When I realized that the unit came with it's own backup battery I tried to return the spare battery, only to be advised that it could not be returned, despite the fact that the package had not been opened. I contacted American Express through which I had purchased the oxygen concentrator and spare battery; and try as they would the company advised that all sales were final. This fact was never pointed out to me and my suggestion is that before dealing with Inogen One any prospective purchaser should consider very seriously the consequences of the extremely strong unnecessary sales pitch for the purchase of this product and it's ancillary attachments. Despite the run-around by the company/agent, for the past two months, the battery was returned to the Inogen agent some four weeks ago, on the understanding that there would be a $99.00 restocking fee. However in a followup telephone call today I was advised that the battery could not be returned and they were sending it back to me. Get all your facts before you consider buying this product. A most dis-satisfied purchaser. LAM