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Yes, not sure how accurate the focal length are but a number have click stops. They can be adjusted too up and down marginally but that would be messy of course. The meades, televue, vixen and zhumell 8-24 all seem to share a similar design, although the vixen have an additional element and use lanthanum. I think I read somewhere that some of these might be made in Taiwan. Usually televue and vixen are pretty accurate in terms of QC.
Probably a burgess planetary or UO ortho might be safer and better quality wise at around the same price but the zooms get a pretty good rap, have good eye relief, reasonble weight and field and would be handy being able to go in and out to locate objects. So not the perfect eyepiece but might have a couple of handy features in practice - maybe. Have heard rotating zooms can be a pain though because of the helical eyepiece adjusters.
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