First off, the LR rides really well on your back. On longer rides I didn't notice the weight like I have on other packs. It sits comfortably and is not restrictive.
Putting the LR reservoir into the pack is a different story. When full, the reservoir is difficult to fit into the zippered pocket...even when the pack is completely empty and the compression straps are all loose. You really have to push the reservoir down hard for it to get into the spot it needs to be. Once there is wont' move so there is one benefit to the inconvenience. The only thing worse than the super tight fitting reservoir is routing the hose through the bag. There is one loop you have to thread the hose through in the reservoir compartment. Then you have to route the hose out of the reservoir compartment into the main storage pocket. Then from there you finally externally route the hose out of the main storage pocket. The last opening is small. So small that you can barely push the mouthpiece through without wanting to rip the pack to shreds. You can disconnect the hose from the reservoir and thread it through reverse to the hydration pack but since doing that I've had issues with it coming detached from the reservoir. Either way it's more work than one should have to do to go for a ride. I've had people tell me to just leave the hose in and only remove the reservoir to refill every ride. Well that's all fine and dandy if you like nasty dirt caked lip scum mouthpiece to drink from. Personally I like to wash the mouthpiece and the hose after a ride.
There is plenty of storage room in the pack and can fit more than enough gear in the pockets. There is a main storage pocket, a intermediate pocket that houses the included tool pouch (nice touch), and a lined pocket for your phone or glasses (both will not fit at the same time). There are also two hip strap pockets that allow for quick access to items without having to take your pack off.
There are plenty of compression straps to prevent the pack from moving and they do their job. There are two straps that compress the reservoir area but I haven't had to use them because the pack stays in place. These straps have sewn in loop on the end and are pretty long but so far I have not snagged any branches with them.
You can route the hydration hose out the left side of the pack but you will lose the ability to use the magnetic retention system. The magnetic/plastic piece can be removed and there are two sections of strap (only on the right shoulder strap) that you can choose to have it on. These straps are not mirrored on the left shoulder strap so if you like to route your hydration hose down the left shoulder strap just be aware that you will not be able to use the magnetic retention device on that side.
Ventilation is better on this pack than previous LR models but it still gets quite warm.
I would love to see some side external pockets to hold items like bear spray (if you live in those areas). Overall this pack will get the job done and carry your water more comfortably. Camelbak has a good LR system here and hopefully they keep refining the design of the remainder of the pack.