Because the Storm is British (i.e. NOT Japanese ) it's been a little crippled by the coders so it's nowhere near as good as it should be.
However, it is one of my preferred cars as you have to drive it rather than just 'point and shoot' like the oh so dull rice burning LM's et al.
It's an expensive purchase so if you've not got all that much in the way of credits in the bank I'd wait a while but she is worth having (I've got three of them ).
To give you a clue as to performance, on T2 tyres I can tool a Storm around SSR5 in consistent 1:19/1:20's under race conditions - not exactly stellar perhaps but easily good enough to hand the AI embarassing defeats (then again, that's much of a recommendation !).