Interesting, didn't even know Shopsmith had that. I don't have any experience with an overhead router, but did spend some time a long time ago researching them, with the intent of making one. However, everything I do can be done quite well with my router in my table, and a pattern bit. And everything I do, is routed following my wooden masters/templates/patterns, whatever you want to call them. They would have some advantage, no need for a bearing bit for one, but just not for me.
"It ain't what you're told, it's what you know." - Granny Weatherwax
Fawkahwe tribal police SWAT Team
Some days, the supply of available curse words is insufficient to meet my demands.
.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.