love my bikes too mucho to transport them in a weak bike carton. I do that only if I have a one way flight and cycle back home. for all other EVOC BIKE BAG PRO is a great bag! Use it since around 15 years, works top and still is in top shape.
I have looked into these as well. However, most are too heavy to fly under the 50lb limit so you can end up with some rather large overweight fees. Then there is the issue with tour companies not able to transport these large bike boxes during the tour. Did the Great Divide last year and had this issue. Cardboard box was recycled at the beginning and picked up a bike shop recycled box at the end. Same thing with end-to-end New Zealand.
I am not really concerned with damage as everything is tightly tied to the frame. They would literally have to run over the box to damage anything. On the other hand I have been on tours where other participants have had a frame or bars damaged by the airline when using these cases (not specifically the EVOC). The other issue is that some of these cases are odd shaped so don't pack well so the airline puts them aside till the end and sometimes runs out of space or forgets about them. This happened to a participant on my central Europe tour. He made it on time but the bike didn't. Luckily he decided to show up a few days early.