TT01 is good if your club has a spec class for it, or you are not racing and jsut hacking around carparks. The TA05 is a competent club-level racer, and has a lot of tuning points as well as hop-up's.
I used to use a TA05 in a 13.5 class, with the TRF shocks as the onyl upgrade
Agama A8 Evo | GRP .21 | Spektrum | Savox
My car just hit 88mph. I hope it comes back soon....