I purchased my AirSense 10 about 8-9 years ago and it still works perfectly. Easy to use, very reliable, quietest machine I've used (out of 5 different ones, from ResMed and other manufacturers).
Three years ago, CPAP.com had them on sale for $500 so I bought a second one, for car travel and for a backup in case the first one dies (it hasn't yet). I have an AirSense Mini for air travel, but I do frequent car trips and I like the 10 because it's much quieter than the Mini and, while the Mini does a very good job with therapy and humidification given its tiny size, the 10 is better.
I can't recommend the Mini. When I first bought it, it seemed like a miracle. The therapy was very good, the humidification using the included discs was perfectly adequate and a good trade-off for portability. It was noisier than the full size machine, but I got used to it and again, it's a good trade-off. Unfortunately, I no longer works after 7 years. 7 years of life would be okay for a machine you use every day, but I only used the Mini when traveling by plane, which is 3 times a year for about 4-5 days each. So, I've used the machine 15 days a year for 7 years and then it stops working, that's not enough usage to justify the cost IMHO.
Anyway, you're reading this because you're considering a 10 and I wholeheartedly recommend it. They are super quiet, reliable, and last forever. The 11's water tank is prone to spilling or leaks unless you handle it extremely carefully, and the…