The Deep Impact 399 2017 vs Deep Impact Center Console 2018 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
The power gap is worth calling out. Rated to 400 hp, the Deep Impact 399 2017 has a 50-hp advantage over the Deep Impact Center Console 2018's 350-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Deep Impact Center Console 2018 carries 482 gallons versus 45 gallons in the Deep Impact 399 2017. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Deep Impact 399 2017 is rated for 12 passengers, while the Deep Impact Center Console 2018 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Deep Impact 399 2017 could be the deciding factor.
Bottom line: Choose the Deep Impact 399 2017 if your priority is putting more people on the water — it handles 12 passengers and at 40,0 ft it has the deck room to back that rating up comfortably. The Deep Impact Center Console 2018 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 11 that costs less to run day-to-day.