The best thing to do is fit them, ride, then see what you think. I’ve been running my 140mm 29er 34 Floats for 6 months now and I think I’m only now getting the best out of them. They are quite linear in feel, so if you’re used to a fork with a progressive spring rate the 34’s will feel a bit divey at first, especially in descend mode, but if it’s a problem you can add some float fluid to the air chamber (5ml at a time up to about 15ml) which will give a more progressive feel.
I noticed a wee difference in mine with 5ml added, I might add another 5ml, but for now I’m getting on fine.
The CTD and Trail Adjust settings are simple and should only take a couple of rides on familiar trails to set up. I run the pressure in mine quite low, set the trail adjust to soft, and the CTD lever to Trail. This set up feels pretty much spot on for everything.
I think Fox have tried to cover too many bases with the standard damping, but with a few tweaks here and there you can successfully set them up ‘just so’.
I’d like to try the new 29er 150mm Pike for comparison though.