Hi, Jadetho74, I have been very happy renting equipment for almost five years. Haven't really stopped to analyze cost differentials, but I like having someone to call if I need help with it. Also, my Medicare advantage policy pays for almost all of it, so that is helpful. Initially I had the big concentrator with a tank filler on top. Huge, loud, and unwieldy. I also had big portable tanks which I refilled. They were heavy and awkward. After reading about the small portable concentrator, I called around until I found a local company to rent one from. Now, my life is much easier. When I go out, I use a small, 5lb. mini-concentrator which goes over my shoulder. It only lasts about 3 hours on low, but it came with an extra battery, and they easily snap in and out. You can also charge it at home and in the car, while you're using it. At home I use a small, molded plastic concentrator the size of a suitcase, which rolls around and has a handle on top. I don't think I would change the arrangement. At this point it's second nature, which takes some practice, but fewer bumps in the road is the goal. Hope you figure it out, if you haven't already. I'm available to ask questions, if you need to.