I have the Incase DSLR Pro pack, and I love it. It's my main bag for traveling and toting a ton of gear around. A couple things:
1) The straps aren't as cushy as I'd like. So a full bag with laptop, lenses, and a couple bodies will hurt your shoulders after a while.
2) The width of the top opening of the bag is not tall enough for a DSLR + battery grip.
I don't think this bag will be able to do what you want. A camera on a gimbal wouldn't be able to be turned downward into the bag, will it? There's definitely not the thickness to have a camera body plus lens be horizontal in the bag. It was made for the camera to be pointed down towards the floor and placed into the top. Maybe you could remove the lens from the camera and drop it in, but even then you'd need to remove basically all the dividers from the back compartment.
Now in regards to the back compartment only opening up while the backpack is not on your back, this is a great safety feature for traveling. Nobody can stick their hands into the main compartment and steal your lenses/bodies while the bag is on your back. This is great for traveling on buses, subways, trains, etc where you're standing in a crowd and being bumped around. You don't have to worry if someone is slowing unzipping your backpack and working on stealing your gear.
Once the camera is off your back, the way it opens up is pretty cool. You basically lay the backpack out on its front side and open up the back and you've got a pretty convenient work station with all your gear laid out in an organized manner.
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