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Eyepieces that are expensive cost more because they use better components, better and more glass elements that are polished longer, better coatings, better QC. All those extras add up.
I wouldn't spend the money on a Delos with the sole intention of getting better planetary views. On nights of good seeing you should notice better contrast and sharpness in the Delos, but a lot of the time there won't be much difference. Where Delos excels is deep sky. That is where you will see a nice improvement over your Orion Edge On Planetary. Bigger, flat field of view, high transmission and contrast, great colour fidelity.
If you are keen to improve planetary viewing no eyepiece comes close to observing through a bino viewer. I've seen more with a bino coupled with good orthos and Plossls, than I will ever see in a Delos.
But on the flip side, bino viewers don't perform nearly as well on deep sky because of the light loss in the system. So that still makes the Delos the best all round option for viewing everything in my opinion.
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