On the trail
In that configuration, the Aerios 25 is comfortably the best-carrying pack in this roundup. The aluminum framesheet and hipbelt work together properly — you feel the load shift onto your hips and your shoulders just guide rather than carry.
For a lighter 8–10 lb day load, the advantage disappears and the weight penalty becomes a net negative. At that load, you'd rather be carrying the Gossamer G4-20.
Build quality
Arc'teryx's construction quality is hard to argue with. The seams, zippers, and fabric all feel like they'll outlast the warranty — which is good because the warranty is a standard limited coverage rather than lifetime. The 210D Robic nylon has been in hard service across a full season and shows minimal wear.
Who this is for
The Aerios 25 is for hikers who consistently carry 14+ lbs, prefer a conventional hiking pack over ultralight alternatives, or want a pack they can walk into a REI and try on before buying. It's also a good choice if you're sharing a pack between users of different sizes, since it fits a wider range of bodies than more precisely sized ultralight packs.