I own a 2004 SmokerCraft Pro Angler 172, have kids, and use it for all purposes. It handles rough waters fine (within reason given the size) and as long as the navigator knows what they are doing, you’ll remain fairly dry and in one piece, this includes Leech, Mille Lacs and Rainy. That goes for any boat. It’s a nice, wide beam, open and your typical deep-v layout. An bigger Ultima would be all this and more. A lot of nice aluminum deep-v’s out there, riveted and welded. If you are not brand-biased you will read that SmokerCraft designs a solid hull. I do not think you would be disappointed with an Ultima, especially if it is an 18′. I would not hesitate on buying another Smoker.
Enjoy your boat!