Some highly rated oxygen concentrators include AirSep Focus, LifeChoice ActivOx Pro Model and the Invacare XPO2, according to Portable Oxygen Solutions. Other models that receive good reviews include the Inogen One G3 Single Battery and AirSep Freestyle 5.
Highly rated oxygen concentrators with continuous flow include the Respironics SimplyGo and the O2 Concepts OxLife. For oxygen concentrators with intelligent delivery, highly rated options include the Inogen One G3 and Inogen One G2. Some of the factors considered by review websites when rating an oxygen concentrator include the maximum oxygen production, maximum delivered pulse volume and available settings. The weight of the battery and battery time are also taken into account.