I just finished assembling my Core One.

I definitely understand how the printer works better than if I bought it assembled. It'll definitely save me time troubleshooting/maintaining/repairing it later. But I spent more time building it than I could ever save during teardown/rebuilds.

I bought a kit because I like building stuff, the Core One kit had the same appeal as a Lego model or a model car. If that's not appealing to you, do yourself a favor and buy the completed printer.

If you do get the kit, get a couple of ice cube trays to use to organize fasteners; keeping them organized in the bags Prusa sends was a battle I wasn't interested in fighting.