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I've not heard of this filter, John, and you've produced a very a very nice image for quick bash (the framing and FOV with the 2600MC and EON85 are awesome). The stars looked well controlled and I can't see any obvious halos; have you tried it on any of the brighter stars to see how it handles reflections/halos? If there are none, then that would be a distinct advantage over the L-extreme in addition to being significantly cheaper. I have an Antlia ALP-T Ha-Oiii filter and I've not seen any halos, but it's significantly more expensive than the SV220.
What is the focal length of your EON? Slower than f/5?
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