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I have no experience of other electronic filter wheels but the ZWO just works. If you're interested in narrowband - and living in the city, I would be - then get the 8 slot.
The only thing I don't like about the ZWO filters themselves is that the OIII band only seems to be covered by the green filter and little by the blue, which is different from other deep sky filters. This means that the expected turquoise ends up mostly green. Aesthetic only of course, but personal taste and all that.
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