keep in mind that the filter is only enhancing what is already there by removing some of the skyglow, i have the Baader UHC-S/O-III.
as far as im aware the baader uhc-s is a lot more forgiving than a lot of other uhc's making it usable in smaller scopes. i can say that yes it makes a large difference on SOME nebulae and others it seems to do not much at all, if your scope is 8"+ id probably be looking for an O-III filter which dramatically improves contrast but you will start to lose stars in smaller scopes.
usually the first filter i reach for is the O-III
