A load of my mates own this pack and raved on about it so I was convinced to purchase one for myself.
I love CamelBak hydration packs and wouldn't buy anything else. This designers of this pack have though of everything. The addition of a Modular Connection System to a CamelBak system is brilliant. And I'm loving the positive shut-off (no more worrying about leaks) and even a bite valve cover!
The only problem my mates have had (they're heavy users of this pack) is that the clip for the cross-strap is fragile and has broken on 2 out of 4 packs.
Other than that - it's an amazing pack that works well for daily / overnight use. I'm planning on using it for a 6 month overseas adventure next year (travel light).