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Good to see you're enjoying the binoviewers Peter. Remember to refocus each side of the bino to cater for different sets of eyes - kids often have more equal focus for their eyes than adults, so it's probably best (on average) to set the diopter adjustment to the same point for both eyepieces when kids are viewing.
Image brightness is reduced through binoviewers but this only becomes an issue when observing objects that are already dim. For the price and performance it's easy to justify owning a set of WO binoviewers, even if you only ever looked at the Moon.
I use WO bino's for the Moon and planets and I don't see any loss of image quality compared to a single eyepiece, but my observing conditions are poor and I rarely get to go above 140x. I also like using them for brighter DSO's. Two eyes seem to add an extra dimension to the image.
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