Testing:
Forgive the point and shoot quality here.
I had a few hours on Sunday to begin testing the G on our local test track. The trail is moderate, but has steep hills and many cross-axle obstacles to guage stability, traction, articulation, locking differential activation, etc.
Front tire is just in the air, due to the angle of climb, which has shift the weight rearward. Center locker on, then rear locker on - easy.
There is no question the G has less articulation than the Discovery I, but feels stable regardless, most certainly aided by the longer wheelbase and low center of gravity. Has anyone removed the front anti-swaybar, and to what effect? The anti-swaybar is low and vulnerable anyway, and attaches to the control arms.
Even with the completely stock suspension, head toss is minimal and damping is fine. It does lose composure pretty quickly at speed, but no worse than the Discovery (but much worse than the Tacoma with all the go-fast suspension parts). The G does have an almost intangible ride quality, probably the combination of low COG, best-in-class seats and suspension design. It does lift a wheel easily compared to a Land Rover, but seems complete composed when doing it. I would say the suspension travel is similar to an 80 series TLC.
I like the locker activation, and convenience of the switches on the dash. Simple and fast activating, somewhere between the ARB (fastest) and the Toyota (slowest).
It has been an interesting couple months, having driven the Defender, Discovery 5-speed, J8 Diesel, Unlimited JK Rubicon and the G-Klass interchangeably. The G feels the most solid, in nearly every way. Tight, even with over 100,000 miles on it. Excellent ergonomics and the best seats of any SUV in the segment, by a wide margin. The lockers, ground clearance, factory 32" tires, approach and departure angles allow the G-wagen to do silly stuff on the trail. I nearly forget to air down (and often don't), as it never seems to need the traction and the ride is so good.
I still prefer driving the Discovery, mostly because it is more difficult (I really need to pay attention to line, tire placement, airing down, etc on the trail above), with a shorter WB, open diffs (for now), manual transmission, etc. The Disco has a better driving position, and a brighter cab. The Jeep is just unstoppable, but has much larger tires, better articulation and much lower gearing. The Defender has the fun-factor nailed, and does pretty well on the trail, though I am very cautious with it. It has F/R air lockers, so traction is not a problem, though gearing is. At low RPMs, that little diesel just does not have enough torque for such a heavy truck, and even with the 3.31:1 low range, the 3.54 axles are too high for the trail, but just right for the road. Switching to 4.10 would be great on the trail, but kill mileage and cruising on the highway - tough spot.
In reality, any serious modifications to the G will just ruin it. It is perfect, as is, for what we need it to do. I am just going to address a few minor things, add some rocker panel protection and a factory rear bumper (off of the 460 model). I might test it with the swaybar off.