Hi, I noticed there aren't a lot of answers on here. I'm not an expert on oxygen concentrators since my background is more on patient monitor accessories, but from what I know is you have to determine first what specific features are important to you, then choose one that suits your budget.
If you need a more professional recommendation, I'm sure your doctor can suggest some brands or you can ask some people who use oxygen concentrators which brands they recommend.
I was not really having a problem breathing at first. My throat was burning; I thought I had strep throat. I had pain in my neck, and there was swelling around my collar bone. The first doctor I went to said he did not know why there was swelling. He gave me antibiotics and told me that if the swelling was not better to come back in two weeks. I went back in two weeks and he said he did not know what was wrong. Since I do not have insurance, I went to a hospital emergency room, and they said I have COPD, I lost touch with reality. January 2018 I started on the COPD natural herbal formula we ordered from GREEN HOUSE HERBAL CLINIC, We spoke to few people who used the treatment here in the United States and they all gave a positive response, my symptoms totally declined over a 7 weeks use of the Green House COPD disease natural herbal formula. I am now almost 70 and doing very well, the disease is totally reversed! (Visit their website www . Greenhouseherbalclinic . com) I am thankful to nature, herbs are truly gift from God. I will keep sharing more awareness, Share with friends!!