Thoughts from a first time Acronym buyer. I recently got the P10-DS, J25-WS and S7-C, all in size S.
P10-DS: I'd like to echo what everyone else has said about these pants. I love the fit, the material, and most of the pockets. I see myself eventually becoming one of those girls that wears yoga pants and running shoes everywhere, except with $600 technical pants and I'm a dude.
I haven't found great use for the carabiner garage - I feel like the obvious things would be stuff like keys or a packed J25-WS-shaped object, but most of the time I'd rather not have that kind of stuff just hanging out back there and I have a better place to put them, say a different pocket or a backpack.
The phone pocket will fit my entire iPhone 6, but there's not a lot of room above and I'm worried that I'll knock the phone out of the pocket and send it crashing to the ground if I move at all.
I'm using the DSPTCH fidlock belt with this, which seems to be a pretty good combination.
Regarding fit, I tried on a pair of the ACG woven pants in S recently and these are definitely feel slimmer all-round, although I'm not sure these correspond.
J25-WS: I've been wearing this out in the currently temperamental NYC weather, which has worked pretty well. It's probably a little too chilly for most people to wear just this and a shirt underneath, but since it blocks a lot of the wind I find it perfectly acceptable. Comparing this to a Patagonia Torrentshell, even though it's lighter and has some extra niceties, I would say it's definitely not worth the extra cost beyond the look.
Incidentally, the jacketsling has the (probably unintended) ability to act as a makeshift dart for the jacket.
S7-C: I got this in an S because I didn't read the note on the ACRNM website saying to size up. While it probably would look good a little oversized, it definitely fits like an S, and the 1/2 chest on the website is accurate. I am not sure if I would size up for this, because I want this a little slimmer for layering. I compare to my Reigning Champ sweatshirt, which fits similarly, but feels tighter because the material is significantly thicker. It fits under the J25-WS pretty well, although obviously the two hoods is a little awkward. Big fan of the hood shape and the shoulder articulation.
I got this in black, but the colour looks a lot more faded than pictures I've seen suggest. Definitely looks cool by itself, but given the choice I would probably prefer it a bit darker.
Overall, I'm pretty happy with my purchases, but not so much my bank account.