This chair arrives with all the settings torqued down low, closed, and tight. When you first sit down your reaction is going to be "This thing is about as comfortable as a rock!"
But don't worry, you just need to personalize your new seat. Loosen up the back tilt and find the right seat depth that feels most natural.
The most important thing is to move the lumbar height bar to the right position, and loosen up the lumbar flex so it has some give and conforms to your back. Properly adjusted, the lumbar section should accommodate the natural curve of your spine comfortably. Not poke out too strongly, and not allow your back to flatten out too much.
Apart from that it's going to be down to personal preference. I like having the tilt tension tight enough so I can lean back a little while typing but not bottom out all the way back. Of course you can also set the tilt stop, but I like leaving that at click #4 so I can tilt most of the way back if I want to stretch.
Now, as other posters have mentioned, the seat and back cushions are pretty dense. So far it hasn't been uncomfortable for me. But if it bothers me in the future I think a cushion of soft foam sheeting would distribute my weight a little more comfortably.
I find the arm rests brilliant. I wasn't sure how they were going to be able to glide-adjust without feeling cheap, but they seem to have found a way. We'll see how they hold up over the years....
So, should *you* get this super expensive chair? It absolutely depends on your needs. I.e. why are you looking at chairs in this price range? If you are hale and hearty and care more about whether your seat has leather than lumbar, or you mainly want a neat status symbol for your office, then I'd say skip this chair and go for something more ostentatious, plush, and classically designed.
But if you have back problems and have to sit in front of a screen all day to work, then this very customizable chair could make a big difference. I have disc herniation in my lumbar spine, so a properly fitting seat is pretty much the most important thing in my working life.
Here's a good litmus test: Imagine you could have a perfectly fitting, totally comfortable chair *except* the cushions are too hard, and you would have to put a pad on it. What would your reaction be? "What a rip off!" or "Awesome! Foam is cheap". Answer that question for yourself and you will know whether the leap is right for you. (Disclaimer: You may not need foam, it's just a thought experiment)
Seating history: I find aerons uncomfortable. Prior to this leap, I have been using a quality high-back seat from Global, bought circa `98 for the upper $400 range. It was very robustly constructed but it doesn't have nearly the adjustability of the leap-- permanent uncomfortable arm rests and no way to customize the lumbar. But it served me well and I look forward to this leap lasting me at least a decade too :)