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Depends on what you're coming from, but I have an Amia and I think it's great for the price. If you're looking at it new, it's 70% the price of a Leap for 90% of the chair. If you're looking at it used, you can find it locally for under $200 since it's much less well-known than the Leap or Aeron.
I would say that the lower back support is great compared to most of the sub-$500 new chairs most people buy. It's about on par with an Aeron with the foam lumbar support, with the Aeron maybe only being slightly better and definitely not worth the price difference. Haven't used a Leap long term so I can't really compare, but I can't imagine it's much more different.
IMO the strength of Steelcase products is that their 4 way adjustable armrests are leaps and bounds better than any Herman Miller products and available on products costing hundreds less. If you're coming from a cheap office chair that you bought on Amazon or at Staples, then I would not hesitate to buy the Amia if you found it used for under $200.
You might benefit more from an adjustable back support pillow like this one. It takes the pressure off your lower back and distributes it more to the upper back. I have one of these and like it, but I don't have lower back pain enough for it to be that useful to me so my wife uses it. She suffers from chronic lower back pain. It really works if you can adjust it right.
Another thing you might consider is adding a lumbar support cushion to your chair, and mount it slightly higher than you normally would such that the butt of your pistol tucks underneath the pad. I got this for in the car, and noticed right away that it made my pistol much more comfortable.
After watching this video: [link] - I've come to realize using this at work is actually fucking up my APT even more.
Speaking from experience, I agree with what he's saying in the video I linked above. I'm constantly stretching my hip flexors/psoas/etc to fix my APT but in the end, if you're not working to fix this on a 24/7 basis, you're not going to make any real progress.
Also, these two videos are helpful for many - I haven't made any real progress with them since I don't focus on correcting it 24/7 but I will starting today: