X-traction, your V6 number is obviously wrong, not sure where you got it, but carcrazy has the right numbers and if you compare JLX to JLX it's close to 300lbs (266lbs to be exact).
I used the comparison tool on Suzuki.ca, to compare different models of the GV to similar suv's. The weight was listed, and is still what I quoted. I didn't use the more direct specification pages because they wasn't working for me yesterday. They are working today and verify your numbers. Could the new engine plus some sound insulation and thicker side glass add up to 300lb over the outgoing 2.7 V6 version? Where would all that weight go? Did Suzuki make signficant other changes they're not talking about?
I checked the Suzuki USA site, but it still has the 2008 models. Suzuki Japan lists their 2009 model range as 1830kg to 1940kg (for the diesel). The latter is a whopping 4268lb. That's the same as a first generation Pathfinder. (Which had a real frame, steel skidplates and all sorts of heavy duty underpinnings.) I agree this degree of weight gain is enough to slow the thing down.
The extendable visors are something owners have wanted, especially since the GV lacks a sun band across the top of the windshield. (Despite the fashionable abundance of blacked out windows)
I noticed in a photo of the black interior, the leather seat bottom cover of the drivers seat is stretched. This seems to happen to some of them (including mine) and Suzuki has a mixed record of correcting it.
Suzuki still doesn't offer skidplates, even as an option.
To comment on Day 3. Some new generation GV's seem to have intractable alignment problems. They wore out tires on the back end like crazy, and I would imagine that would involve forces on the drivetrain. Suzuki also had to replace parts in a number of customers' drivetrains. This was far from universal. Ours shows normal tire wear, and has no odd driveline noises except a faint droning at 1500rpm.
The seat heaters may come on hot, but after a while they almost shut off for a while, then come back warmer. It would be nicer to have a 2-temperature switch. But, hey, it cost less than a Lexus.
Ah yes, the drivers mirror. I saw this the moment I drove ours home in December of 2005. I took it back, and after a day with it, the dealership said it was not warped. Now, I could SEE it was warped. And warped the wrong way, making things wider. I could understand it if they said it was warped but within specs. But, I have one of those little wide angle mirrors on it. I could tell they had removed it because I could tell it had been moved. So they'd removed it. Why would they remove it if they saw nothing wrong? So they must have been untruthful with me when they said they found nothing wrong with it. They also failed to do anything about the stretched leather seats. That was the last time I took the GV to them for service. But, the alternate dealership has been no better. Now they're failing to deal with squealing rear brakes, and a corroded rim. All these things are known problems. Would it cost Suzuki a whole lot to stand behind these minor warranty matters?