Does anyone own a Shake 'n Go Car Racing Set? and would you recommend them?

My 3 year old is really into playing Mario Kart on Wii and loves cars. In order to entice him away from my Dad’s Wii and computers in general…I’m thinking of buying him a Scaletrix kind of thing for Christmas but he’s never played with one before and as he’s only three I’m looking for something that will engage him.

I wondered if anyone could give me a review of one of these or something similar…

Do you have one or something similar?
What would you recommend?
Or can you point me in the direction of a good toy review site?

I don’t know anyone that has one either so I couldn’t let him try one out first…:-/