There aren't any 'extra' curves in the Unifit! The curves are what make the required trap and are either cast internally in the toilet, or in the case of the Totos with a Unifit, in the adapter iteself. ANd, they are likely smoother than those cast in porcelain. It won't be a problem. The only issue with installing one is you have to drill four holes in the floor to anchor the rear end (which is where the toilet actually attaches. The front of the thing installs like a toilet onto the flange. It comes with a template to locate the new holes. If you have a tiled floor, you may need a diamond core bit or a tile spade bit to drill the holes. That is the only 'extra' thing.