Depends on what you do. If you're just using it for vinyl...even using the most expensive vinyl, Saving an extra few percent of vinyl will take years to pay it off.
If you're doing substrate cutting, it makes more sense.
And my super expensive is in relation to Flexi providing it for free with their software... Before onyx even came out with there's.
I'm not a big fan of DLC / Addons. Imagine if Adobe started making their own addons for illustrator.. New features should be included in new versions of the software, not sold as a seperate program.
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Now you have onyx gold, onyx hub, onyx truefit.. You have to pay for their new color checking option.. Pretty soon you'll be getting the base print only onyx, and everything else will be an addon. That, or they do away with the buy once, and everyone is stuck on the new onyx go platform!