The Achilles LSI-104 2006 vs Achilles SG-124 2007 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 - Achilles LSI-104 2006 at 10,0 ft versus Achilles SG-124 2007 at 12,0 ft. At 77 lbs and 175 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 35 hp, the Achilles SG-124 2007 has a 25-hp advantage over the Achilles LSI-104 2006's 10-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Achilles SG-124 2007 is rated for 5 passengers, while the Achilles LSI-104 2006 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles SG-124 2007 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Achilles SG-124 2007 comes in at 5 lbs per hp versus 8 lbs per hp for the Achilles LSI-104 2006. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Achilles SG-124 2007 if your priority is putting more people on the water - it handles 5 passengers and at 12,0 ft it has the deck room to back that rating up comfortably. The Achilles LSI-104 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.