Review (5/5): Works fine if you don't need a lot of mobility
This tubing, as other reviewers have noted, is a little stiff and inflexible instead of being more soft and pliable like more expensive tubing. However, it works just fine for my purpose.
I have to bleed 2 LPM into my CPAP machine from an O2 concentrator. To minimize the noise, the concentrator sits in the hallway outside the bedroom door with the tubing coming under door. I use 3M "Command strip" hooks to guide the tubing around the room to the CPAP machine and keep it off the floor. I don't need flexible and pliable, so the slight stiffness doesn't matter, and having clear tubing instead of green tubing running around the room keeps my wife a lot happier.
I don't know how long it would actually last. I changed the first tube at six months, and it seemed perfect, so I've let the second one go longer. It's a 10 months, shows no signs of mold or deterioration, and O2 flow is still fine. I'll change it at the one-point just as a matter of principle.