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On the lomo the zoom is very very close to the TMB planetary at 9mm, very hard to call it, on the 10" SCT the zoom is extremely good.
At the very least, using a zoom lets you see what size different magnifications give you, and the AFOV isn't bad on the click-stop and the eye-relief is pretty good as well.
I find them great for star hopping and finding items manually, wound out at 24mm to get it in the eyepiece, then zoom in to get it dead centre and take a peek. If the seeing turns out to be worth extended viewing, then you can reach for your favourite eyepiece and pop it in. Often though the zoom is more than good enough for the seeing on the night.
For the price, I think they are a great addition to the kit, they won't replace every stop in the range for everyone, but they are extremely useful, especially when trying to decide what mags are best for your scope.
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