Air sprung shocks feel dead/overdamped when compared to coil sprung shocks IMO. I think a lot of this is probably due to the extra friction/stiction in air shocks because of the much larger seals, and the high air pressure inside causing even more stiction in the first place. I find it noticable on any air sprung bike that you have to apply a certain pressure in the first place to get the shock to move at all, before the then linear(ish) spring rate then takes effect. On a coil sprung bike, you apply a force, the shock compresses a bit, you apply the same force again, it compresses the same amount more…
Air shocks have their place, but IMO that isn't on bikes that are predominantly used for descending, or for "mucking about on" if you like. Air shocks make sense on XC bikes as they're lighter (in fact they make more sense to the marketing people, because coil shocks mean that someone somewhere has to hold stock of different spring rates!), but for ultimate performance, a coil shock is pretty much always going to win out. And like you want to get rid of the DHX air on your Bottlerocket, I've been wanting to change the DHX air on my Reign X for a coil shock for some while… Maybe I will soon enough!