I've had the z65 for over a year and it is the best pack that I own. I have put this through way more than they say it is capable of and it is still holding up great with no signs of falling apart. In the past year I have used this for about 150 days, from 8 day backcountry trips in the in Wasatch and the Rockies to rainy Northeast overnighters. I also take this on long, one day winter hikes (but always pack extra in case I need to spend the night out) and it does great. There is plenty of room for all my gear, but I don't feel like the pack is too big either. The front loading pocket is very useful for quick access to cloths that you might need to take out or stuff in the pack while on the go. I now have two Gregory packs (the other is a day pack), the shoulder straps and hip belt are very comfortable on both of them and I think my next pack will be the bigger Gregory Denali Pro because I don't want to try and keep stuffing 85L worth of gear into this bad boy. Gregory's customer service is very good and one time fixed the zippers on my other pack for free and very fast, you can't go wrong with any of their packs, they have it right.