Just received my blackbird in tall, I'm 6'1 with an athletically stocky build and a longer torso than normal. And It feels like the pack was tailored for me. Luckily i read the reviews below regarding the arc'teryx sizing because i was torn between ordering tall or regular. here's the link for sizing http://www.arcteryx.com/sizing-charts.aspx . I have yet to use the pack in the field, but it will be used in Niseko Japan in two weeks. From what I can see, the bag is up to arc standards, and the skin seems completely waterproof and indestructible, plus it holds all of my hydrator system, first aid kit, avalance gear, shovel, probe, etc. and still has plenty of room for other mountain essentials. Arc stuff is expensive, but Murray's laws are true, you get what you pay for, and if it seems too goo to be true its probably just another great product from Arc'teryx! I'll keep you guys filled in on how it holds up this first season, but from the looks of it, it's not going anywhere.
Just wanted to add this to the review. just finished a trip in japan and the hip suspension disc contraption really worked well while i was snowboarding, as long as the fit of the pack is right and you have the load supported by your hips, it really allows the bag to move with your body and not contort while you're trying to grabs or hard turns.