Does the Kohler McGee come with a seat?

No. The toilet ships as bowl and tank only, so you need to buy a seat separately. An elongated seat is required to match the bowl.

What rough-in does it need?

It is built for a 12-inch rough-in, the most common spacing in US homes. Measure from the finished wall to the center of the floor bolts before buying.

How does the dual flush work?

It offers two flush volumes, with a maximum of 1.6 gallons. The lighter flush handles liquid waste and the larger one handles solids.

Is the skirted trapway hard to install?

The skirt covers the trapway, so the install looks cleaner, but the bowl is heavier and the mounting is less forgiving than an exposed-trap toilet. A two-person lift is sensible.

How does it compare with a one-piece toilet?

A one-piece has no tank seam and is easier to clean, but it is heavier and harder to install alone. The McGee's two-piece build keeps installation simpler at the cost of a visible seam.