Rough-in and fit
Connelly models are 12 inch rough-in. TOTO's specification does not offer a 10 or 14 inch alternative on this range, so measure before ordering.
WASHLET+ fitted
Both Connelly models here are sold as WASHLET+ sets — the bidet seat is included and the power cord and water line are concealed behind the skirt, so there is nothing visible.
What the Connelly offers
A skirted trapway hides the bends and curves at the base of the bowl, so there is far less to clean around than on a traditional two-piece.
Dual flush gives you 1.28 gallons for solids and 0.9 for liquids, which is among the more water-efficient configurations TOTO makes.
Two-piece, but skirted
Most skirted toilets are one-piece and heavy. The Connelly gives you the skirted look while still arriving as a separate tank and bowl, which makes it far easier to carry and fit.