Both the Malibu Response LXi 2007 and the Malibu Response LXi 2011 are modified-V designs, both built in fibreglass, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department - Malibu Response LXi 2007 at 20,0 ft versus Malibu Response LXi 2011 at 20,5 ft. Weight tells a clearer story for trailering families: the Malibu Response LXi 2007 tips the scales at 2 800 lbs - 200 lbs more than the Malibu Response LXi 2011 at 2 600 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 share a closely matched power ceiling - 400 hp for the Malibu Response LXi 2007 and 410 hp for the Malibu Response LXi 2011. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads - 41 gal and 40 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Malibu Response LXi 2011 is rated for 9 passengers, while the Malibu Response LXi 2007 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Malibu Response LXi 2011 could be the deciding factor.
Bottom line: Choose the Malibu Response LXi 2011 if your priority is putting more people on the water - it handles 9 passengers and at 20,5 ft it has the deck room to back that rating up comfortably. The Malibu Response LXi 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.