I only have good things to say about this harness! Granted I've only used it in the gym a couple times, sport climbing once and trad climbing once. Maybe I'll update this review later.
So breaking it down, pros and cons.
1) comfort is incredible, I upgraded to this from the old black diamond momentum and the difference is astonishing. I attribute the comfort to the width of the waist belt. The only thing more comfortable would be big wall harness (no experience with those, I live in Texas). Bring on the hanging belays. 4/5 stars for comfort.
2) organization: I was quite content with the black diamond gear loops that stick out to the sides and make clipping/unclipping gear easy. I WAS a little concerned that I wouldn't like the arcteryx gear loop. no concern any longer. once you get a few quick draws/cams/whatever on there they are great. PLUS the 5th gear loop. like a genius, I only put stuff I know I won't use while leading on the 5th rear gear loop (ATC, Prusick, Anchor cordalette) so it's fine. But I will say it's pretty darn hard to get stuff from that loop. Just don't plan on putting your quick draws back there. 5/5 stars for organization.
3) packability: pretty straight forward. It probably saves enough room (compared to old BD momentum) to fit an additional pair of shoe in my back. It compresses down to about the size of both my fist. 5/5 stars for packability
4)Function: This is what people talk about when they say "I forgot I was wearing this harness" It just moves with your body and conforms to your hips like a sweet lover (brown-chicken brown-cow). 5/5 stars for function.
5) style: I think this harness looks pretty boss. The dark green with neon green accents is pimpen. 5/5 stars for style (which is what it's all about right?).
1) Price: the one and only true downside. One does not simply purchase arcteryx equipment without taking out a second mortgage. the only consolation is I was looking at the BD chaos (which is $125). I HIGHLY recommend spending the extra $20 to get his harness (or just get 2 $60 harness ha).
2) adjustability: not a cons so much as an observation. If you're not used to fixed gear loops, it takes some getting used to. For reference, I normally wear a size 32 jeans and I measure the circumference of my leg was about 22.5 inches around. I got a size medium and it fits great. Enough room that I can layer up, and I wouldn't want leg loops any tighter. currently they're snug but not tight or pinching by any means.
Over all I highly recommend this harness for gear junkies like me who feel they need an expensive harness for some reason. but really, it's a very well designed piece of equipment and I'll probably purchase another arcteryx harness when I have to retire this one!
EDIT: right after I bought this harness, Black Diamond came out with their "solution" harness which appears to be very packable(thin like arcteryx), lightweight, with no 5th gear loop and much smaller gear loops but only half the price (and can probably find on sale sooner or later). While I haven't tried that harness, I can still say this. If you're just sport climbing (don't need a lot of racking space) you might wanna check out that harness. I also have multi pitch trad climbed with BD smaller gear loops and was totally fine.
With that last part being said, I still give this harness 5 stars (maybe 4.5 considering the price) because it functions SOO well.