that style is a bit bigger...but defenitly slower and worse handling...
i am 6'1 and almost 200, i fit just fine on my mini rocket, and ive seen bigger people than me on there without a problem...
also the aftermarket on the smaller ones (cag/ZR/daytona) is much better. you cant find shit for the bigger ones(even if they say its 'performance' its really not...)
the bigger ones have alot more electrical also, and if you have seen the quality of these bikes, you want to keep it simple, cus whatever is there will break.
go to pocketbikex.com and check it out...there is alot of info there, i highly suggest doing homework on this, even thou it is just pocket change...
specifically check out this:
http://www.pocketbikex.com/viewtopic.php?t=589
ADAM