Jeremy,
The details of the filter can be found here
http://www.company7.com/baader/options/moonskyglow.html
The filter transmission graph is also located in the website. From what I observed so far, it does help to reduce skyglow and makes the sky slightly darker. It is more apparent on the moon and enables it to look grey/white instead of yellow which is due to the light pollution; the yellowish mainly is due to the light pollution and not the eyepiece colour tone. Also the skglow surrounding Saturn became darker as without the filter, however, it did not seem to help Saturn too much despite darkening the sky around it and changing the colour from yellowish to more whitish; strangely I could pick out low contrast details better without the filter on Saturn but that is mainly on Saturn's globe. It could be because of the slight change in colour of Saturn (more white) and hence it is harder to pick out detail on the globe. On the moon, this filter helps a lot.
This is the second time I am using. I will investigate further. From what I read when this filter is combined with the Baader MV and WO MV filter on achros, it makes the colour more natural (filters will alter the colour of an object) and removes much of the CA.