Seem like neat racks with neat ideas incorporated. Though I must say I ran my spare on the roof of my FJ60 for a couple months. It was only a 32" on a steel wheel and I only had a 2.5" lift on the truck and me being just shy of 6 feet tall, dammit, that tire was a PITA to get up there that high. I'll never run a spare up top again.
I also must say, there is no way in hell I would trust just an adhesive on the front mounts if I ran any harder trails than the main drag and the mall parking lot. One nicely placed tree limb or rock overhang and that thing is gonna tear the factory roof rack straight off the top of your roof. Probably mangle the ******** outta your roof while its at it. IMO, those front legs *have* to be bolted in if you are doing any serious expeditions or off-roading. That being said, going from the pics alone, it looks totally doable to get the front legs bolted into the roof. (And if you're spending $1500 on the rack, whats another few bucks to have it drilled and mounted to the roof properly?)
As to the pricetag of these suckers, they obviously bring a lil something different to the table as far as 4runners and roof racks go, but I also would never be paying that much for a full length rack for any vehicle. Like has been said, you could build or have somebody else build something near identical but customized to your needs for quite a bit less.
-Ferg-
