Currently using the ZWO EFW with 5 2"filters. I recently added it to my configuration and it just worked. Although, I'm currently using a OSC for imaging, I have added a Optolong CLS-CCD filter and the L-extreme filter. The other filter is a Sybony dark filter for taking darks. Everything works smoothly and it's easy to select filters while you are imaging. Obviously with a mono camera you'll have different filters.