I’m sort of eying an inflatable 2.0 ATA model for Xmas. It’s around $3.8K shipped direct from the manufacturer. Not sure why a hard shell should be inherently better so long as the soft shell model reaches the right pressure. Even at 1.5 ATA you largely get the same benefits but need to stay in it longer and it’s already a large time commitment.
Unless needed post surgery, wound healing, etc., I’d think soft shells are better choice as cheaper and safer with the mild 1.3-1.5 being less stress on body, less risk of toxicity, or ear/sinus issues. Much of upside without possible downside & cost.
The effect won’t be the same as with an ATA 2.0. I also think you need to stay longer in the capsule. I’m really time-efficient, or at least I try to be.
Yes, not as powerful and more of a time commitment to achieve what a hard shell can (if even possible), but soft shell is great for me. I think it depends on your goals.
As to what John mentioned, I know very little about IHT but it sounds interesting and logical.