I read Harry's review of the Slot.it Porsche Evo. I was going to post this as a comment, but I didn't want to jack the thread. These comments are based on Harry's review, and in particular, Superslab"s response.
I am constantly amazed at how good, and ahead of their time, the original Fly cars were. Slot.its have been top-tier since they were introduced, and Maurizio continues to tweak and improve the line, but it is still a ten year-old Fly that stands as the solid comparison to this modern model. (that is without even mentioning that their body work totally changed the hobby of slot racing, for everyone) As Superslab points out, with a little work, the old Fly models will compete with most anything out there from today, or yesterday, and probably tomorrow too (my own comment). I own a lot of Slot.it cars, several NSR models, a couple of Scale Auto slot cars, and two Black Arrow racers. They are good slot racers, but I think Fly still stands as the pinnacle in slot cars.