I bought the cheaper 7.5 - 22.5 mm Seben on eBay for about $35, and I find it really handy! Optics are surprisingly good for such a budget price.
I set it for 22.5 mm for "browsing" the sky, and for acquiring targets, and then zoom in as required for viewing the target, once I have found it. For optimal viewing, I will then swap out for a suitable fixed eyepiece, but it's really handy for general casual star-gazing.
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