I installed two Vespins with unifits, and in my opinion setting the unifit is way easier than trying to put a wax ring on the bottom of a standard toilet then trying to set in on the flange without damaging the wax ring. I used the unifit as a template, using a carpenters square to make sure it was reasonably square to the wall. I put the wax ring in the unifit, placed it on the flange and basicly stepped on the flat plastic part to compress the wax ring, then wood screwed the four screw holes to the floor (I was going through linoleum). I then made sure it the thing was level with a small level.
The design of the unifit connection to the toilet is great, a little liquid soap on the rubber gasket and it slipped right in,There is a bit of a funnel shape on the unifit to toilet connection so alignment is not supercritical.
Be sure that your toilet bolts are in the unifit before you set the toilet in place. Also, if its a two piece unit, bolt the tank on before setting the toilet. It is not so heavy that you cannot manage to line it up.
I spent more time taking the parts out of the box than the actual installation took.
It is so simple a cave man could do it.
Toto Vespin II CST474CEFG with SS114 Softclose seat.
This bowl was installed on a 13-1/2" rough-in using the 14" Unifit adapter.
The water shutoff can be as close as 5-1/2" to the left of center, unless it's higher off the floor, and then it can be even closer to center.
This shutoff had been replaced with a new 1/4 turn valve with brass nipple through the wall.
Installation was by James Love of Love Plumbing & Remodel 206-949-5683
In some of the older Seattle homes, the old toilets had been wall mounted tank toilets.
Those typically are 14" rough-in and need a flange repair to use standard closet bolt connections at the flange.
Everything is on the truck for that.
The Vespin comes with a standard 12" adapter or you can order a 10" or 14" adapter depending on your rough-in distance.