To follow up on my Zeb A1 180mm comments above, I ended up putting a Secus on it last September and it now rides how I want it: nice off the top, good midstroke support, 5-10mm travel in reserve on most trails if I'm riding at 100% and have bottomed it out a couple of times on the biggest features.

Prior to that I was running it at higher pressure to get the midstroke support I wanted but always had 25-30mm unused travel. Running it softer for more travel felt very divey in the midstroke especially on slow steep trails. 0 tokens previously and still 0 with the Secus. The newest air springs (DebonAir+) weren't available back then but they're reported to feel more supportive in the middle and a few friends seem to be happy with them.