hello my name is Wayne and I know that my wife has written a review but I want to say something too. I have a concentrator and a carry portable one also and let me tell between Tasha (manager0 and Ray our delivery man,I would be lost they always make sure it is working so the I can get out and about and not have to stay home all the time. When my portable was in repair shop they made sure I had enough tanks to use and they are very respectful and kind. Thet Rapid City team are the best !! please make it a great work place so that we do lose not them thank you so much !!