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the CLS increases the signal to noise ratio vs not using it at the same location. it almost acts like a (mid range) narrowband filter for all the important wavelengths.
at a dark site using the CLS will also increase the signal to noise ratio but by a much lesser difference.
lesser filters (wider and/or with less transmission %) may not to as good a job as the cls.
it is really hard to compare your images, so many variables still remain esp things like the elevation when shot, moon, the dimness of the target, perhaps even background illumination from a field of laptops.
but I agree the cls does a great job - not such a great job on star colour balance though ... as not using it. from home I went from 70second exposure max to 3 minutes before background sky glow started causing havoc (when using my dslr).
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