We came to Long Island, NY from Florida and my husband needed to have tank of oxygen and one at night that converts the air to oxygen for him. I called several places, but decided on Alpine (the other places wanted a lot more for a deposit). So glad I chose Alpine! Their rep Bill Buhse was there with a lot of time so we had the oxygen at night. Also, we ran into a problem ON MEMORIAL DAY! Of course things happen when everyone is closed. On a federal holiday and on a day off, Mr Buhse came over to the house so that we would have the walk around oxygen working properly. Hats off to Mr Buhse. Shows this company really cares about their clients. When we return to Long Island (which we do every summer) I will be sure to call ONLY Alpine. You can't go wrong with this company.