Yeah, I totally agree, whatever works. It's all personal preference.
I still did some fine sanding after using the microplane thing, but the surface was reasonably smooth. It probably wasn't as smooth as a routered surface, but close. I've only used it on the mahogany, so I don't know how it will perform on harder woods.
I like the speed of routers, but you have the tear-out possibility. I like the robosander, but you have the dust. To me, this is kind of a compromise between the two. It's cheap enough that if you don't like it, it's not that big of a deal.