As a Rev DP RCT3 owner I can vouch for the above ^^^ being a good description of how the adjustments work.
They are much easier to set up than previous dual air Rockshok Revs as they balance themselves between the positive and negative. My Rev Race from 2010 were a pain in the ass to set up.
I ride in the Lakes but venture to Yorkshire Wales and Scotland with them too and they work great. They replaced a set of Lyrik coils that I loved but paid a heavy price in weight to lug around.
I’ve got the dual position ones that are handy for steep climbs and really quick and simple to flick between. The same goes for the compression adjustment that can be done on the fly.
I’ve had them about 5 months and so far so good. They will be getting a light service next month to clean the muck out and change the oil.
Can’t say how they compare to Fox as only ever had RS or Marz forks.