my notion is (no offense),
if you want to buy a XB,and you dont want to upgrade your car, go for TT-01
if you want to enjoy the full build process,TB-02 give you more things to do when you waiting the body paint drying,because it more complicated,more adjustable

TT-01 live for ppl just want to enjoy more Drive
TB live for who want more and more and mooooore.


and,mike i think ya want more LOL, the day you trip come beijing , a super discount I promise,maybe 130 bucks per TB02 with full bearing ^-^