The guy may be big, but do you think he brought those tyres along specially? They look as if they are about 4.5in diameter. Just look at the way the spokes are laced into them.
The only one of the machines featured I've seen in the flesh is the Kia. My ski instructor mate put his Genius in the back of one to take it back up to Gourette at the end of today's ride.
The people at Kia must have read a few of Defender Dan and Mad Mole's posts and decided us Bmers fit their target audience profile. :-/