Whilst on holiday in Spain, my wife was hospitalised for 15 days with breathing problems. After being successfully treated, doctors were reluctant to discharge her unless she had access to pure oxygen. I searched online and found a Portable Oxygen Concentrator available from Intermedical Homecare in the UK. I ordered the POC at approximately 11 am on a Wednesday. It arrived at 3 pm on Thursday - incredible! My wife was discharged from hospital and now, back home in the UK, still uses the POC and gets almost instant relief when her breathing is bad. I highly recommend this firm.