Delta Yacht Sales (Isleton, CA)
I've admired this model and have compared it to the 34 Californian of old like mine. The hull is different from ours...perhaps more similar to the Navigator line. I had an acquaintance with a 48 Nav who loved it. He liked the ride, although he said it was a little wet at times in the SF Bay and Pacific. If you plan to stay within the bay and delta primarily, I suspect it would be a great boat with a turn of speed....something I wish I had at times.
The hull has a sharp entry and 7 degree deadrise at the transom, so I'd expect a hull that cuts through the waves but can pound with too much speed. It's easy to pull the throttles back for the optimum ride/speed combo.
If you're thinking of a sea trial out of Rio Vista, catch a windy day on the ebb tide for a good check of its ride in swells.
Don't know much about the Volvo engine, but seems most late model Navigators and Californians come with them.