None.
Hard in operation while turning when in 4X4 mode. A full time 4 wheel drive model added to this line will be appreciated. However, it is a strong SUV which protects my family during an impact. But, with a bit more money, the Lexus RX300 will be a smarter choice with bigger power, more comfortable and better handling.
I was thinking about buying either a MB ML320 or the Lexus RX300 rather than a 4Runner. Have you looked at the comments pages for these vehicles? 99% of the comments for the 4runner were positive. 99%of the comments for the ML320 and the RX300 are about how expensive they are to fix and how often they fail. I'm going to stick with Toyota, they seem to know how to make a vehicle that lasts!
The Toyota 4 Runner is designed for off road use or extreme condition driving when in the four wheel drive selection. When you turn your front wheels, they are traveling at a different speed than the rear, causing them not wanting to go on road surfaces or any other surface with a lot of traction. In a mud or snow condition, the slick surface will allow the slower moving tires to match the speed while slipping. Four wheel drive is not designed for normal use, all wheel drive which contains a center differential is designed for this. Damage can occur when using a conventional four wheel drive system on a high traction surface.