3 main issues:
1. The hydration pocket is super poorly designed! Arcteryx seems to have an issue with this - I bought the Arcteryx Bora 80L off BC a few years ago, and its hydration pocket is wacky too (in the lid of the pack. Why would you want your heavy water up so high?) In the Quintic, the hydration pocket doesn't have a strap to hold the top of the bladder up high, so the whole thing just kind of slumps to the bottom of the hydration pocket. Also, the hydration pocket has a vertical zipper along it, and no hole for the tube to escape! This means that you have to run the hose out of the top of the zipper, and over the course of a few hours, the hose works the zipper open.
2. The snowboard carry is poorly designed - there are no compression straps that actually cinch down on the width of your snowboard. It just kind of hangs in the loops, and can wiggle freely.
3. The A frame ski carry is poorly designed too! The bottom ski carry straps tie directly in to the waist belt (presumably to transfer more weight to your hips as you hike.) The non-adjustable-length ski carry straps then attach to the center of the back panel of the pack. If you fully stuff the pack with gear, the un-adjustable straps aren't long enough to allow you to wrap the hip belt around your waist! (It ends up pulling the hip belt away from your waist, and it bunches up, all ugly.
redeeming qualities: looks like the fabric is waterproof. looks cool. don't buy this pack.