Giving up on my 66 ATA...
180mm fixed Domain. Same weight as the 66, and since I found myself not using the adjustable travel (ATA) anyhow, no loss there. Damping feels great right out of the box, just like all the other Motion Control forks I've used, without having to fiddle with a bunch of crap. Stock spring is a little soft - going to swap in the firm vs. the stock spring. Rebound adjustment makes a much more palpable difference.
I also far, far prefer the Maxle to Marzocchi's quick release 20mm thing.
It's quiet. None of the sloshing or clicking sounds my 66 ATA was making.
Same axle to crown height - no issue there. Checked the oil level right out of the box - spot on. Seems like every company has issues with that from time to time.
I'm playing with the idea of taking a Boxxer Ride U-turn coil, swapping the topcap/knob setup from a Domain U-turn coil onto the thing, and attempting to make a Domain 180mm U-trun fork. (ok, well 133-178mm reall) The top bits from the U-turn coils are able to be removed, just not really intended to be.
Not that I need it, just more to see if it can be done.
I think I'm at a size/weight that the stock RS stuff seems to work pretty well for me. Stock springs or one heavier have always worked without more fiddling for me. I get good sag, don't have heavy bottom out, and don't wallow in the travel.
Once I get thing set where I like them, I don't like having to f#%k with them, either.