[Kiwi3]

...Yes it's true, according to Neel Jani (who should know, being Toro Rosso's Friday test driver during 2006).

"It's very hard to drive these cars, but this is a track I like.

"To be quick you have to find a way to slide these cars without losing time, it requires more skill to drive these cars than in F1." (source: Autosport.com)

I would have thought they would be a lot easier to drive. Being significantly slower the G-Force experienced must be a lot lower.