As said by some people, awesome cars, there quicker than scoobys mate no doubt about it, the import version is 255bhp stock and they have a much better pull from 3rd gear on, scoobys have the edge in 1st and 2nd as there made for 0-60 runs, after that gt4's munch them for dinner.
As for running costs, totally agreed there high maintance and cost alot, there very special but lets face it there old cars now so you expect maintance.
Tuning is very good with them, get the right mods and know what your doing and can see big figures.
As for against a starlet, they beat alot of starlets easily, i ran my TD04 starlet against my brothers gt4 rolling start and its dead even, remember mines around 230bhp maybe abit more against his 330bhp, get that on a standing start and he will be about 10 cars lengths in front by top of second.
~Nick