I finally got around to trying my kit in the Daytour 230, and have summarised some thoughts below.
The 5d2 / 24-70 fits through the quick access opening of the top compartment while the 7d / 70-300vc just squeezes in the quick access hatch of the lower section.
Unfortunately the 5d2 seems too wide to fit in this side entrance to the lower compartment, so I don't have the flexibility I had hoped for.
There is less padding than that offered by lowepro and kata backpacks I've had before. It seems adequate enough but isn't as soft/thick.The overall build quality of the bag is good, it does feel solid and well made. The full length top compartment panel opening on the back is well implemented. The bottom of the bag has a rubberised coating where it would touch the ground.
The spaces either side of the camera lens in the top compartment are restricted in their use slightly by the curvature of the bag. For example my cokin square filters (in their original individual plastic holders) fit at the bottom of the top compartment but not higher up at the sides because it becomes shallower higher up.
The external top side pockets are kind of flush with the sides of the bag but stretch out when there's stuff in them, which is good in a way as it's easier to squeeze stuff in but it does offer less protection and means that the edges of the filter boxes I've put in them jut out a bit. Not much of a problem but I'd rather have had an extra couple of cm of 'loose' space in the side pockets before they had to stretch.
The pocket on the side of the bottom compartment is useful when open as it's got a retaining 'net'. However it can't fit much in it at all if you want to put items in and close it over.
Overall though it does offer much better value for money than the kata 3n1-25PL I have. I doubt anyone without knowledge of the cost of branded camera bags would think the Kata was twice as expensive. I still haven't found the 'perfect' camera bag for me, but I'm closer than I was before buying the Daytour 230.