I don't have a Sundance, but I believe it's a step down from our ElkRidge.
What I can tell you is that the ElkRidge was not designed for full-time use, and is not warranted as such. But we've had very good experiences with the unit in mid/range temps, 45*-85*.
Colder and hotter, the unit is not as well insulated as the full-time units, so the ACs (we have 2) can't keep up as well, and/or the furnace runs more frequently.
The tanks are smaller than full-time units, so you are dumping more frequently.
The kitchen sink is on the small side, so washing dishes is a bit of a challenge.
Propane tanks are two 30# units, many full-time rigs have 40# so refilling becomes necessary sooner in the colder months.
Nevertheless, our floorplan works well for us and it has held up very well for 15 mo of continuous use. But, we've also made modifications so we don't have as many issues. We added thermal curtains to help with heat and cold transfer through the windows, as well as tank and pipe heaters for the winter, to name a few.
Sent from my iPhone using Tapatalk