The Odyssey Millennium 2302M 2003 vs Odyssey Millennium II 2302M2 2004 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.
On paper these two are close siblings in the size department - Odyssey Millennium 2302M 2003 at 20,0 ft versus Odyssey Millennium II 2302M2 2004 at 22,0 ft. Weight tells a clearer story for trailering families: the Odyssey Millennium II 2302M2 2004 tips the scales at 2 050 lbs - 200 lbs less than the Odyssey Millennium 2302M 2003 at 1 850 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
Both boats are rated for 14 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Odyssey Millennium 2302M 2003 and Odyssey Millennium II 2302M2 2004 are closely matched on the specs that matter most. Test-ride both on the water you actually use, check current dealer pricing, and factor in long-term service access before you sign.