That's a brilliant bag imho
Very comfortable for walking distances/carrying all day - the hip-belt works. Laptop pocket is very useful for waterproofs/hydration bladder/other odds'n'sods too (if you're not carrying a laptop). Top compartment and panel pockets holds quite a bit of gear (photographic or non-photographic) - I use it for day-walks. It will also take a Sigma 150-500 in the top compartment (suitably wrapped of course).
Camera access is very easy.
For 'future reference', I carry my tripod or monopod by putting the head in the mesh side pocket and securing the legs with a cinch strap threaded through the carry-handle. I also carry a waterproof rucsac cover just in case - as this bag doesn't come with one. I often carry my waterproof/fleece under the bottom 'camera compartment safety-flap' cinch straps.