my friend has one.. i have an 06 636.... my opinion is... in a straight line from a roll i can let him get the jump and pass him i am more experienced though as a rider.... but.. when it comes to cornering (which is by far the best part about these machines) i can enter a corner on his bike at about 10+ miles per hour compared to my 636 and feel more stable throughout the corner (i also need a new rear on my bike)

you definately need to upgrade the seat on the 07 because its hard as a rock my 636 seat is a million times better than the 07 in the comfort department.... overall i am very happy with my 636 and would only get an 07 if i could find a used one that i would turn into a track bike because i would love to ride the 07 around a track compared with my 636... one day ill make it there