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I setup the QUAD scopes because achieving a similar signal:noise ratio in the city vs a darksite required a 25 fold increase in number of images.
So saves on acquisition time by a factor of 4 but then stretches processing time by a factor of about 5.
In total I estimate it takes me 5x longer to capture and process images from the city than from the dark site (assuming a 3:1 process vs acquisition time ratio). But for the city using 4 scopes reduces total time by about 25% vs 1 scope.
The refractors are all entry level doublets (Skywatcher 80mm and William optics) and post Samsung's withdrawal from the DSLR market their nx500 model went very cheaply for a while.
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